Update v8-array-buffer.h

Author: ronag

deps/v8/include/v8-array-buffer.h

@@ -460,8 +460,7 @@ class V8_EXPORT ArrayBufferView : public Object {
    * Copies |count| bytes from |source| starting at |source_start| into
    * |target| starting at |target_start| using memmove semantics. Unlike
    * CopyContents, this method handles both source and destination, supports
-   * byte offsets, and requires no HandleScope. Behaviour is undefined
-   * if either view is detached or if the range exceeds the view bounds.
+   * byte offsets, and requires no HandleScope.
    */
   static void FastCopy(const ArrayBufferView* source, size_t source_start,
                        ArrayBufferView* target, size_t target_start,