[heap] Update CodePageCollectionMemoryModificationScope docs

The scope can be (and is) used by compiler threads, i.e. not just by the
main thread; update the comment.

Change-Id: Ifbeb414761cee4ab12dd953f0cd544f35c92fc8a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3516037
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79445}

src/heap/heap.cc

@@ -2542,7 +2542,7 @@ void Heap::MarkCompact() {
   SetGCState(MARK_COMPACT);
 
   PROFILE(isolate_, CodeMovingGCEvent());
-  CodeSpaceMemoryModificationScope code_modifcation(this);
+  CodeSpaceMemoryModificationScope code_modification(this);
 
   // Disable soft allocation limits in the shared heap, if one exists, as
   // promotions into the shared heap should always succeed.

src/heap/heap.h

@@ -2559,9 +2559,8 @@ class V8_NODISCARD CodeSpaceMemoryModificationScope {
   Heap* heap_;
 };
 
-// The CodePageCollectionMemoryModificationScope can only be used by the main
-// thread. It will not be enabled if a CodeSpaceMemoryModificationScope is
-// already active.
+// The CodePageCollectionMemoryModificationScope can be used by any thread. It
+// will not be enabled if a CodeSpaceMemoryModificationScope is already active.
 class V8_NODISCARD CodePageCollectionMemoryModificationScope {
  public:
   explicit inline CodePageCollectionMemoryModificationScope(Heap* heap);