Spellchecking compiler comments

This PR cleans up the rest of the spelling mistakes in the compiler comments. This PR does not change any literal or code spelling issues.

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -203,7 +203,7 @@ impl<'a> Parser<'a> {
         &self.sess.span_diagnostic
     }
 
-    /// Relace `self` with `snapshot.parser` and extend `unclosed_delims` with `snapshot.unclosed_delims`.
+    /// Replace `self` with `snapshot.parser` and extend `unclosed_delims` with `snapshot.unclosed_delims`.
     /// This is to avoid losing unclosed delims errors `create_snapshot_for_diagnostic` clears.
     pub(super) fn restore_snapshot(&mut self, snapshot: SnapshotParser<'a>) {
         *self = snapshot.parser;

compiler/rustc_parse/src/parser/expr.rs

@@ -276,7 +276,7 @@ impl<'a> Parser<'a> {
                 lhs = self.parse_assoc_op_ascribe(lhs, lhs_span)?;
                 continue;
             } else if op == AssocOp::DotDot || op == AssocOp::DotDotEq {
-                // If we didn’t have to handle `x..`/`x..=`, it would be pretty easy to
+                // If we did not have to handle `x..`/`x..=`, it would be pretty easy to
                 // generalise it to the Fixity::None code.
                 lhs = self.parse_range_expr(prec, lhs, op, cur_op_span)?;
                 break;

compiler/rustc_parse/src/parser/mod.rs

@@ -150,7 +150,7 @@ pub struct Parser<'a> {
     pub current_closure: Option<ClosureSpans>,
 }
 
-/// Stores span informations about a closure.
+/// Stores span information about a closure.
 #[derive(Clone)]
 pub struct ClosureSpans {
     pub whole_closure: Span,