Fixed spacing on code block under Comments.

Even though github was rendering this correctly; I did this to fix tools
like https://github.com/suan/vim-instant-markdown from breaking syntax.

README.md

@@ -1242,7 +1242,7 @@
         this.total = 0;
       }
     }
-  ```
+    ```
 
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es5/README.md

@@ -757,7 +757,7 @@
 
       return this;
     }
-  ```
+    ```
 
 **[⬆ back to top](#table-of-contents)**