Auto merge of #66653 - ivan:lint-name-fix, r=Centril

docs: fix lint name for `unused_variables`

Author: bors

RELEASES.md

@@ -7804,7 +7804,7 @@ Version 0.7 (2013-07-03)
       * extra: Implementation of fixed output size variations of SHA-2.
 
    * Tooling
-      * `unused_variable`  lint mode for unused variables (default: warn).
+      * `unused_variables` lint mode for unused variables (default: warn).
       * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
         (default: warn).
       * `unused_mut` lint mode for identifying unused `mut` qualifiers

src/doc/rustc/src/lints/levels.md

@@ -35,7 +35,7 @@ talk about later in this section.
 ## warn
 
 The 'warn' lint level will produce a warning if you violate the lint. For example,
-this code runs afoul of the `unused_variable` lint:
+this code runs afoul of the `unused_variables` lint:
 
 ```rust
 pub fn foo() {