compiler: fix typos

librustdoc: fix typos

compiler/rustc_errors/src/lib.rs

@@ -1698,7 +1698,7 @@ pub enum Level {
     /// internal overflows, some file operation errors.
     ///
     /// Its `EmissionGuarantee` is `FatalAbort`, except in the non-aborting "almost fatal" case
-    /// that is occasionaly used, where it is `FatalError`.
+    /// that is occasionally used, where it is `FatalError`.
     Fatal,
 
     /// An error in the code being compiled, which prevents compilation from finishing. This is the

compiler/rustc_hir_typeck/src/fallback.rs

@@ -85,7 +85,7 @@ impl<'tcx> FnCtxt<'_, 'tcx> {
             return false;
         }
 
-        // not setting the `fallback_has_occured` field here because
+        // not setting the `fallback_has_occurred` field here because
         // that field is only used for type fallback diagnostics.
         for effect in unsolved_effects {
             let expected = self.tcx.consts.true_;