Fix Rails and RSpec integration branch references

Some of them are off, and should better be referenced by a ref.
GitHub performs a redirect from master to main.

Author: pirj

benchmarks/before_block_capture_block_vs_yield.rb

@@ -42,11 +42,11 @@ def capture_block_and_call_n_times(n, &block)
 example context.
 
 rspec-core has already performed [many related benchmarks about
-this](https://github.com/rspec/rspec-core/tree/master/benchmarks):
+this](https://github.com/rspec/rspec-core/tree/main/benchmarks):
 
-- [call vs yield](https://github.com/rspec/rspec-core/blob/master/benchmarks/call_v_yield.rb)
-- [capture block vs yield](https://github.com/rspec/rspec-core/blob/master/benchmarks/capture_block_vs_yield.rb)
-- [flat map vs inject](https://github.com/rspec/rspec-core/blob/master/benchmarks/flat_map_vs_inject.rb)
+- [call vs yield](https://github.com/rspec/rspec-core/blob/main/benchmarks/call_v_yield.rb)
+- [capture block vs yield](https://github.com/rspec/rspec-core/blob/main/benchmarks/capture_block_vs_yield.rb)
+- [flat map vs inject](https://github.com/rspec/rspec-core/blob/main/benchmarks/flat_map_vs_inject.rb)
 
 The results are very interesting:
 
@@ -64,7 +64,7 @@ def capture_block_and_call_n_times(n, &block)
 > See also `flat_map_vs_inject.rb`, which appears to contradict these
 > results a little bit.
 >
-> -- https://github.com/rspec/rspec-core/blob/master/benchmarks/capture_block_vs_yield.rb#L83-L95
+> -- https://github.com/rspec/rspec-core/blob/main/benchmarks/capture_block_vs_yield.rb#L83-L95
 
 and
 
@@ -75,7 +75,7 @@ def capture_block_and_call_n_times(n, &block)
 > version remains faster in my benchmarks here no matter how small
 > I shrink the `words` array. I'm not sure why!
 >
-> -- https://github.com/rspec/rspec-core/blob/master/benchmarks/flat_map_vs_inject.rb#L37-L42
+> -- https://github.com/rspec/rspec-core/blob/main/benchmarks/flat_map_vs_inject.rb#L37-L42
 
 This seems to show that the error margin is enough to negate any benefit from
 capturing the block initially. It also shows that not capturing the block is

features/controller_specs/README.md

@@ -2,7 +2,7 @@ Controller specs are marked by `:type => :controller` or if you have set
 `config.infer_spec_type_from_file_location!` by placing them in `spec/controllers`.
 
 A controller spec is an RSpec wrapper for a Rails functional test
-([ActionController::TestCase::Behavior](https://github.com/rails/rails/blob/master/actionpack/lib/action_controller/test_case.rb)).
+([ActionController::TestCase::Behavior](https://github.com/rails/rails/blob/main/actionpack/lib/action_controller/test_case.rb)).
 It allows you to simulate a single http request in each example, and then
 specify expected outcomes such as:
 

lib/rspec/rails/matchers/have_http_status.rb

@@ -1,6 +1,6 @@
 # The following code inspired and modified from Rails' `assert_response`:
 #
-#   https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/testing/assertions/response.rb#L22-L38
+#   https://github.com/rails/rails/blob/main/actionpack/lib/action_dispatch/testing/assertions/response.rb#L22-L38
 #
 # Thank you to all the Rails devs who did the heavy lifting on this!
 
@@ -243,7 +243,7 @@ class GenericStatus < RSpec::Rails::Matchers::BaseMatcher
 
           # @return [Array<Symbol>] of status codes which represent a HTTP status
           #   code "group"
-          # @see https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/testing/test_response.rb `ActionDispatch::TestResponse`
+          # @see https://github.com/rails/rails/blob/main/actionpack/lib/action_dispatch/testing/test_response.rb `ActionDispatch::TestResponse`
           def self.valid_statuses
             [
               :error, :success, :missing,
@@ -313,7 +313,7 @@ def type_message
 
           # @return [String] formatting the associated code(s) for the various
           #   status code "groups"
-          # @see https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/testing/test_response.rb `ActionDispatch::TestResponse`
+          # @see https://github.com/rails/rails/blob/main/actionpack/lib/action_dispatch/testing/test_response.rb `ActionDispatch::TestResponse`
           # @see https://github.com/rack/rack/blob/master/lib/rack/response.rb `Rack::Response`
           def type_codes
             # At the time of this commit the most recent version of
@@ -373,7 +373,7 @@ def type_codes
       #   expect(response).to have_http_status(404)
       #   expect(page).to     have_http_status(:created)
       #
-      # @see https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/testing/test_response.rb `ActionDispatch::TestResponse`
+      # @see https://github.com/rails/rails/blob/main/actionpack/lib/action_dispatch/testing/test_response.rb `ActionDispatch::TestResponse`
       # @see https://github.com/rack/rack/blob/master/lib/rack/utils.rb `Rack::Utils::SYMBOL_TO_STATUS_CODE`
       def have_http_status(target)
         raise ArgumentError, "Invalid HTTP status: nil" unless target

spec/rspec/rails/matchers/have_http_status_spec.rb

@@ -224,7 +224,7 @@ def create_response(opts = {})
     # The error query is an alias for `server_error?`:
     #
     # - https://github.com/rails/rails/blob/ca200378/actionpack/lib/action_dispatch/testing/test_response.rb#L27
-    # - https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/testing/test_response.rb
+    # - https://github.com/rails/rails/blob/main/actionpack/lib/action_dispatch/testing/test_response.rb
     #
     # `server_error?` is part of the Rack Helpers and is defined as:
     #
@@ -278,7 +278,7 @@ def create_response(opts = {})
     # The success query is an alias for `successful?`:
     #
     # - https://github.com/rails/rails/blob/ca200378/actionpack/lib/action_dispatch/testing/test_response.rb#L18
-    # - https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/testing/test_response.rb
+    # - https://github.com/rails/rails/blob/main/actionpack/lib/action_dispatch/testing/test_response.rb
     #
     # `successful?` is part of the Rack Helpers and is defined as:
     #
@@ -336,7 +336,7 @@ def create_response(opts = {})
     # The missing query is an alias for `not_found?`:
     #
     # - https://github.com/rails/rails/blob/ca200378/actionpack/lib/action_dispatch/testing/test_response.rb#L21
-    # - https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/testing/test_response.rb
+    # - https://github.com/rails/rails/blob/main/actionpack/lib/action_dispatch/testing/test_response.rb
     #
     # `not_found?` is part of the Rack Helpers and is defined as:
     #
@@ -395,7 +395,7 @@ def create_response(opts = {})
     # The redirect query is an alias for `redirection?`:
     #
     # - https://github.com/rails/rails/blob/ca200378/actionpack/lib/action_dispatch/testing/test_response.rb#L24
-    # - https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/testing/test_response.rb
+    # - https://github.com/rails/rails/blob/main/actionpack/lib/action_dispatch/testing/test_response.rb
     #
     # `redirection?` is part of the Rack Helpers and is defined as:
     #