improve grammar in comment

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <memory>
 #include <queue>
 #include <set>
@@ skipping 1155 matching lines @@
     void RemoveAllThreads(Isolate* isolate);
 
    private:
     PerIsolateThreadData* list_;
   };
 
   // These items form a stack synchronously with threads Enter'ing and Exit'ing
   // the Isolate. The top of the stack points to a thread which is currently
   // running the Isolate. When the stack is empty, the Isolate is considered
   // not entered by any thread and can be Disposed.
-  // If the same thread enters the Isolate more then once, the entry_count_
+  // If the same thread enters the Isolate more than once, the entry_count_
   // is incremented rather then a new item pushed to the stack.
   class EntryStackItem {
    public:
     EntryStackItem(PerIsolateThreadData* previous_thread_data,
                    Isolate* previous_isolate,
                    EntryStackItem* previous_item)
         : entry_count(1),
           previous_thread_data(previous_thread_data),
           previous_isolate(previous_isolate),
           previous_item(previous_item) { }
@@ skipping 455 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_