typo and formatting

compiler/rustc_expand/src/placeholders.rs

@@ -313,25 +313,24 @@ impl<'a, 'b> MutVisitor for PlaceholderExpander<'a, 'b> {
  // Implement the proposal described in
  // https:/rust-lang/rust/issues/61733#issuecomment-509626449
  //
- // The macro invocation expands to the list of statements.
- // If the list of statements is empty, then 'parse'
- // the trailing semicolon on the original invocation
- // as an empty statement. That is:
+ // The macro invocation expands to the list of statements. If the
+ // list of statements is empty, then 'parse' the trailing semicolon
+ // on the original invocation as an empty statement. That is:
  //
  // `empty();` is parsed as a single `StmtKind::Empty`
  //
- // If the list of statements is non-empty, see if the
- // final statement alreayd has a trailing semicolon.
+ // If the list of statements is non-empty, see if the final
+ // statement already has a trailing semicolon.
  //
- // If it doesn't have a semicolon, then 'parse' the trailing semicolon
- // from the invocation as part of the final statement,
+ // If it doesn't have a semicolon, then 'parse' the trailing
+ // semicolon from the invocation as part of the final statement,
  // using `stmt.add_trailing_semicolon()`
  //
  // If it does have a semicolon, then 'parse' the trailing semicolon
  // from the invocation as a new StmtKind::Empty
 
- // FIXME: We will need to preserve the original
- // semicolon token and span as part of #15701
+ // FIXME: We will need to preserve the original semicolon token and
+ // span as part of #15701
  let empty_stmt = ast::Stmt {
  id: ast::DUMMY_NODE_ID,
  kind: ast::StmtKind::Empty,