chore: Fix typos in 'compiler' (batch 1)

compiler/rustc_errors/src/diagnostic.rs

@@ -484,7 +484,7 @@ pub struct Subdiag {
 /// - The `EmissionGuarantee`, which determines the type returned from `emit`.
 ///
 /// Each constructed `Diag` must be consumed by a function such as `emit`,
-/// `cancel`, `delay_as_bug`, or `into_diag`. A panic occurrs if a `Diag`
+/// `cancel`, `delay_as_bug`, or `into_diag`. A panic occurs if a `Diag`
 /// is dropped without being consumed by one of these functions.
 ///
 /// If there is some state in a downstream crate you would like to access in

compiler/rustc_errors/src/emitter.rs

@@ -2300,7 +2300,7 @@ impl HumanEmitter {
                     // For example, for the following:
                     //   |
                     // 2 -     .await
-                    // 2 +     (note the left over whitepsace)
+                    // 2 +     (note the left over whitespace)
                     //   |
                     // We really want
                     //   |

compiler/rustc_errors/src/lib.rs

@@ -817,7 +817,7 @@ impl<'a> DiagCtxtHandle<'a> {
                 );
             }
             // We delay a bug here so that `-Ztreat-err-as-bug -Zeagerly-emit-delayed-bugs`
-            // can be used to create a backtrace at the stashing site insted of whenever the
+            // can be used to create a backtrace at the stashing site instead of whenever the
             // diagnostic context is dropped and thus delayed bugs are emitted.
             Error => Some(self.span_delayed_bug(span, format!("stashing {key:?}"))),
             DelayedBug => {

compiler/rustc_errors/src/markdown/parse.rs

@@ -487,7 +487,7 @@ fn is_break_ty(val: &MdTree<'_>) -> bool {
         || matches!(val, MdTree::PlainText(txt) if txt.trim().is_empty())
 }
 
-/// Perform tranformations to text. This splits paragraphs, replaces patterns,
+/// Perform transformations to text. This splits paragraphs, replaces patterns,
 /// and corrects newlines.
 ///
 /// To avoid allocating strings (and using a different heavier tt type), our