Cleanup documentation a little more about loading extensions

Author: warmwaffles

README.md

@@ -172,7 +172,9 @@ The `Exqlite.Sqlite3` module usage is fairly straight forward.
 ### Using SQLite3 native extensions
 
 Exqlite supports loading [run-time loadable SQLite3 extensions](https://www.sqlite.org/loadext.html).
-A selection of precompiled extensions for popular CPU types / architectures is available by installing the [ExSqlean](https://github.com/mindreframer/ex_sqlean) package. This package wraps [SQLean: all the missing SQLite functions](https://github.com/nalgeon/sqlean).
+A selection of precompiled extensions for popular CPU types / architectures is
+available by installing the [ExSqlean](https://github.com/mindreframer/ex_sqlean)
+package. This package wraps [SQLean: all the missing SQLite functions](https://github.com/nalgeon/sqlean).
 
 ```elixir
 alias Exqlite.Basic
@@ -194,13 +196,33 @@ Basic.load_extension(conn, ExSqlean.path_for("re"))
 Basic.close(conn)
 ```
 
-It is also possible to load extensions using the `Connection` configuration.  For example: 
+It is also possible to load extensions using the `Connection` configuration. For example:
 
-    config :exqlite, load_extensions: [ "./priv/sqlite/\#{arch_dir}/rotate" ]
-
-This method works with `Exqlite.Sqlite3`.  For more info see the (Connection.connect/1)[https://hexdocs.pm/exqlite/Exqlite.Connection.html#connect/1]
-docs.
+```elixir
+arch_dir =
+  System.cmd("uname", ["-sm"])
+  |> elem(0)
+  |> String.trim()
+  |> String.replace(" ", "-")
+  |> String.downcase() # => "darwin-arm64"
+
+config :myapp, arch_dir: arch_dir
+
+# global
+config :exqlite, load_extensions: [ "./priv/sqlite/\#{arch_dir}/rotate" ]
+
+# per connection in a Phoenix app
+config :myapp, Myapp.Repo,
+  database: "path/to/db",
+  load_extensions: [
+    "./priv/sqlite/\#{arch_dir}/vector0",
+    "./priv/sqlite/\#{arch_dir}/vss0"
+  ]
+```
 
+See [Exqlite.Connection.connect/1](https://hexdocs.pm/exqlite/Exqlite.Connection.html#connect/1)
+for more information. When using extensions for SQLite3, they must be compiled
+for the environment you are targeting.
 
 ## Why SQLite3