Remove trailing whitespace and do a minor wording tweak.

.github/workflows/ci.yml

@@ -41,16 +41,16 @@ env:
 # and as such will error out if our dependency tree accidentally tries to use std.
 # https://doc.rust-lang.org/stable/rustc/platform-support/x86_64-unknown-none.html
 #
-# We don't save caches in the merge-group cases, because those caches will never be re-used (apart 
+# We don't save caches in the merge-group cases, because those caches will never be re-used (apart
 # from the very rare cases where there are multiple PRs in the merge queue).
-# This is because GitHub doesn't share caches between merge queues and `main`.
+# This is because GitHub doesn't share caches between merge queues and the main branch.
 
 name: CI
 
 on:
   pull_request:
   merge_group:
-  # We run on push, even though the commit is the same as when we ran in merge_group. 
+  # We run on push, even though the commit is the same as when we ran in merge_group.
   # This allows the cache to be primed.
   # See https://github.com/orgs/community/discussions/66430
   push: