Rollup merge of #88230 - steffahn:a_an, r=oli-obk

Fix typos “a”→“an”

Fix typos in comments; found using a regex to find some easy instance of incorrect usage of a vs. an.

While automation was used to find these, every change was checked manually.

Changes in submodules get separate PRs:
* https://github.com/rust-lang/stdarch/pull/1201
* https://github.com/rust-lang/cargo/pull/9821
* https://github.com/rust-lang/miri/pull/1874
* https://github.com/rust-lang/rls/pull/1746
* https://github.com/rust-analyzer/rust-analyzer/pull/9984
  _folks @ rust-analyzer are fast at merging…_
  * https://github.com/rust-analyzer/rust-analyzer/pull/9985
  * https://github.com/rust-analyzer/rust-analyzer/pull/9987
  * https://github.com/rust-analyzer/rust-analyzer/pull/9989

_For `clippy`, I don’t know if the changes should better better be moved to a PR to the original repo._

<hr>

This has some overlap with #88226, but neither is a strict superset of the other.

If you want multiple commits, I can split it up; in that case, make sure to suggest a criterion for splitting.

compiler/rustc_lint/src/nonstandard_style.rs

@@ -118,7 +118,7 @@ fn to_camel_case(s: &str) -> String {
         })
         .fold((String::new(), None), |(acc, prev): (String, Option<String>), next| {
             // separate two components with an underscore if their boundary cannot
-            // be distinguished using a uppercase/lowercase case distinction
+            // be distinguished using an uppercase/lowercase case distinction
             let join = if let Some(prev) = prev {
                 let l = prev.chars().last().unwrap();
                 let f = next.chars().next().unwrap();

compiler/rustc_lint/src/types.rs

@@ -1171,7 +1171,7 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
                     ty::Projection(..) => {
                         let ty = self.cx.tcx.normalize_erasing_regions(self.cx.param_env, ty);
 
-                        // If `ty` is a opaque type directly then `super_visit_with` won't invoke
+                        // If `ty` is an opaque type directly then `super_visit_with` won't invoke
                         // this function again.
                         if ty.has_opaque_types() {
                             self.visit_ty(ty)