Feedback from #19065. NFC (#19078)

Author: sbc100

src/library.js

@@ -3654,7 +3654,7 @@ mergeInto(LibraryManager.library, {
 
   $HandleAllocator__docs: '/** @constructor */',
   $HandleAllocator: function() {
-    // Reserve slot 0 so that 0 is always and invalid handle
+    // Reserve slot 0 so that 0 is always an invalid handle
     this.allocated = [undefined];
     this.freelist = [];
     this.get = function(id) {

src/library_wasmfs_opfs.js

@@ -16,9 +16,8 @@ mergeInto(LibraryManager.library, {
 
   _wasmfs_opfs_init_root_directory__deps: ['$wasmfsOPFSDirectoryHandles'],
   _wasmfs_opfs_init_root_directory: async function(ctx) {
-    // allocated.length start of as 1 since 0 is a reserved handle
+    // allocated.length starts off as 1 since 0 is a reserved handle
     if (wasmfsOPFSDirectoryHandles.allocated.length == 1) {
-      // Directory 0 is reserved as the root
       let root = await navigator.storage.getDirectory();
       wasmfsOPFSDirectoryHandles.allocated.push(root);
     }