Rollup merge of #88226 - steffahn:an_rc, r=michaelwoerister

Fix typo “a Rc” → “an Rc” (and a few more)

After stumbling about it in the dev-guide, I’ve devided to eliminate all mentions of “a Rc”, replacing it with “an Rc”. E.g.
```plain
$ rg "(^|[^'])\ba\b[^\w=:]*\bRc"
compiler/rustc_data_structures/src/owning_ref/mod.rs
1149:/// Typedef of a owning reference that uses a `Rc` as the owner.

library/std/src/ffi/os_str.rs
919:    /// Converts a [`OsString`] into a [`Rc`]`<OsStr>` without copying or allocating.

library/std/src/ffi/c_str.rs
961:    /// Converts a [`CString`] into a [`Rc`]`<CStr>` without copying or allocating.

src/doc/rustc-dev-guide/src/query.md
61:are cheaply cloneable; insert a `Rc` if necessary).

src/doc/book/src/ch15-06-reference-cycles.md
72:decreases the reference count of the `a` `Rc<List>` instance from 2 to 1 as

library/alloc/src/rc.rs
1746:    /// Converts a generic type `T` into a `Rc<T>`
```
_(the match in the book is a false positive)_
Since the dev-guide is a submodule, it’s getting a separate PR: rust-lang/rustc-dev-guide#1191

I’ve also gone ahead and done the same search for `RwLock` and hit a few cases in the `OwningRef` adaption. Then, I couldn’t keep the countless cases of “a owning …” or “a owner” unaddressed, which concludes this PR.

`@rustbot` label C-cleanup

1 files changed, 5 insertions, 5 deletions

diff --git a/compiler/rustc_data_structures/src/owning_ref/mod.rs b/compiler/rustc_data_structures/src/owning_ref/mod.rs
index 5b27a407ad4..e7397bf13ba 100644
--- a/compiler/rustc_data_structures/src/owning_ref/mod.rs
+++ b/compiler/rustc_data_structures/src/owning_ref/mod.rs
@@ -5,7 +5,7 @@
 
 This crate provides the _owning reference_ types `OwningRef` and `OwningRefMut`
 that enables it to bundle a reference together with the owner of the data it points to.
-This allows moving and dropping of a `OwningRef` without needing to recreate the reference.
+This allows moving and dropping of an `OwningRef` without needing to recreate the reference.
 
 This can sometimes be useful because Rust borrowing rules normally prevent
 moving a type that has been moved from. For example, this kind of code gets rejected:
@@ -1146,7 +1146,7 @@ pub type VecRef<T, U = T> = OwningRef<Vec<T>, U>;
 /// Typedef of an owning reference that uses a `String` as the owner.
 pub type StringRef = OwningRef<String, str>;
 
-/// Typedef of an owning reference that uses a `Rc` as the owner.
+/// Typedef of an owning reference that uses an `Rc` as the owner.
 pub type RcRef<T, U = T> = OwningRef<Rc<T>, U>;
 /// Typedef of an owning reference that uses an `Arc` as the owner.
 pub type ArcRef<T, U = T> = OwningRef<Arc<T>, U>;
@@ -1157,9 +1157,9 @@ pub type RefRef<'a, T, U = T> = OwningRef<Ref<'a, T>, U>;
 pub type RefMutRef<'a, T, U = T> = OwningRef<RefMut<'a, T>, U>;
 /// Typedef of an owning reference that uses a `MutexGuard` as the owner.
 pub type MutexGuardRef<'a, T, U = T> = OwningRef<MutexGuard<'a, T>, U>;
-/// Typedef of an owning reference that uses a `RwLockReadGuard` as the owner.
+/// Typedef of an owning reference that uses an `RwLockReadGuard` as the owner.
 pub type RwLockReadGuardRef<'a, T, U = T> = OwningRef<RwLockReadGuard<'a, T>, U>;
-/// Typedef of an owning reference that uses a `RwLockWriteGuard` as the owner.
+/// Typedef of an owning reference that uses an `RwLockWriteGuard` as the owner.
 pub type RwLockWriteGuardRef<'a, T, U = T> = OwningRef<RwLockWriteGuard<'a, T>, U>;
 
 /// Typedef of a mutable owning reference that uses a `Box` as the owner.
@@ -1173,7 +1173,7 @@ pub type StringRefMut = OwningRefMut<String, str>;
 pub type RefMutRefMut<'a, T, U = T> = OwningRefMut<RefMut<'a, T>, U>;
 /// Typedef of a mutable owning reference that uses a `MutexGuard` as the owner.
 pub type MutexGuardRefMut<'a, T, U = T> = OwningRefMut<MutexGuard<'a, T>, U>;
-/// Typedef of a mutable owning reference that uses a `RwLockWriteGuard` as the owner.
+/// Typedef of a mutable owning reference that uses an `RwLockWriteGuard` as the owner.
 pub type RwLockWriteGuardRefMut<'a, T, U = T> = OwningRef<RwLockWriteGuard<'a, T>, U>;
 
 unsafe impl<'a, T: 'a> IntoErased<'a> for Box<T> {