Auto merge of #58341 - alexreg:cosmetic-2-doc-comments, r=steveklabnik

Cosmetic improvements to doc comments

This has been factored out from rust-lang/rust#58036 to only include changes to documentation comments (throughout the rustc codebase).

r? @steveklabnik

Once you're happy with this, maybe we could get it through with r=1, so it doesn't constantly get invalidated? (I'm not sure this will be an issue, but just in case...) Anyway, thanks for your advice so far!

lib.rs

@@ -393,7 +393,7 @@ impl<'a> Id<'a> {
     /// digit (i.e., the regular expression `[a-zA-Z_][a-zA-Z_0-9]*`).
     ///
     /// (Note: this format is a strict subset of the `ID` format
-    /// defined by the DOT language.  This function may change in the
+    /// defined by the DOT language. This function may change in the
     /// future to accept a broader subset, or the entirety, of DOT's
     /// `ID` format.)
     ///
@@ -530,7 +530,7 @@ impl<'a> LabelText<'a> {
     }
 
     /// Decomposes content into string suitable for making EscStr that
-    /// yields same content as self.  The result obeys the law
+    /// yields same content as self. The result obeys the law
     /// render(`lt`) == render(`EscStr(lt.pre_escaped_content())`) for
     /// all `lt: LabelText`.
     fn pre_escaped_content(self) -> Cow<'a, str> {