Remove double spaces after dots in comments

compiler/rustc_lexer/src/lib.rs

@@ -2,7 +2,7 @@
 //!
 //! The idea with `rustc_lexer` is to make a reusable library,
 //! by separating out pure lexing and rustc-specific concerns, like spans,
-//! error reporting, and interning.  So, rustc_lexer operates directly on `&str`,
+//! error reporting, and interning. So, rustc_lexer operates directly on `&str`,
 //! produces simple tokens which are a pair of type-tag and a bit of original text,
 //! and does not report errors, instead storing them as flags on the token.
 //!

compiler/rustc_lexer/src/unescape.rs

@@ -299,7 +299,7 @@ where
         let tail = &tail[first_non_space..];
         if let Some(c) = tail.chars().nth(0) {
             // For error reporting, we would like the span to contain the character that was not
-            // skipped.  The +1 is necessary to account for the leading \ that started the escape.
+            // skipped. The +1 is necessary to account for the leading \ that started the escape.
             let end = start + first_non_space + c.len_utf8() + 1;
             if c.is_whitespace() {
                 callback(start..end, Err(EscapeError::UnskippedWhitespaceWarning));