sembr tests/crater.md

Author: tshepang

src/tests/crater.md

@@ -1,43 +1,46 @@
 # Crater
 
 [Crater](https://github.com/rust-lang/crater) is a tool for compiling and
-running tests for _every_ crate on [crates.io](https://crates.io) (and a few on
-GitHub). It is mainly used for checking the extent of breakage when implementing
+running tests for _every_ crate on [crates.io](https://crates.io) (and a few on GitHub).
+It is mainly used for checking the extent of breakage when implementing
 potentially breaking changes and ensuring lack of breakage by running beta vs
 stable compiler versions.
 
 ## When to run Crater
 
 You should request a Crater run if your PR makes large changes to the compiler
-or could cause breakage. If you are unsure, feel free to ask your PR's reviewer.
+or could cause breakage.
+If you are unsure, feel free to ask your PR's reviewer.
 
 ## Requesting Crater Runs
 
 The Rust team maintains a few machines that can be used for Crater runs
-on the changes introduced by a PR. If your PR needs a Crater run, leave a
-comment for the triage team in the PR thread. Please inform the team whether you
-require a "check-only" Crater run, a "build only" Crater run, or a
-"build-and-test" Crater run. The difference is primarily in time;
-if you're not sure, go for the build-and-test run. If
+on the changes introduced by a PR.
+If your PR needs a Crater run, leave a comment for the triage team in the PR thread.
+Please inform the team whether you
+require a "check-only" Crater run, a "build only" Crater run, or a "build-and-test" Crater run.
+The difference is primarily in time;
+if you're not sure, go for the build-and-test run.
+If
 making changes that will only have an effect at compile-time (e.g., implementing
 a new trait), then you only need a check run.
 
-Your PR will be enqueued by the triage team and the results will be posted when
-they are ready. Check runs will take around ~3-4 days, and the other two taking
-5-6 days on average.
+Your PR will be enqueued by the triage team and the results will be posted when they are ready.
+Check runs will take around ~3-4 days, and the other two taking 5-6 days on average.
 
-While Crater is really useful, it is also important to be aware of a few
-caveats:
+While Crater is really useful, it is also important to be aware of a few caveats:
 
-- Not all code is on crates.io! There is a lot of code in repos on GitHub and
-  elsewhere. Also, companies may not wish to publish their code. Thus, a
-  successful Crater run does not mean there will be no
+- Not all code is on crates.io!
+  There is a lot of code in repos on GitHub and elsewhere.
+  Also, companies may not wish to publish their code.
+  Thus, a successful Crater run does not mean there will be no
   breakage; you still need to be careful.
 
-- Crater only runs Linux builds on x86_64. Thus, other architectures and
-  platforms are not tested. Critically, this includes Windows.
+- Crater only runs Linux builds on x86_64. Thus, other architectures and platforms are not tested.
+  Critically, this includes Windows.
 
-- Many crates are not tested. This could be for a lot of reasons, including that
+- Many crates are not tested.
+  This could be for a lot of reasons, including that
   the crate doesn't compile any more (e.g. used old nightly features), has
   broken or flaky tests, requires network access, or other reasons.