Fix author name inconsistency & make sort ambiguouity example more obvious (#122)

Author: nathan-contino-mongo

source/fundamentals/crud/read-operations/sort.txt

@@ -25,7 +25,7 @@ insert this data into a collection, run the following operation:
      { "_id": 3, "name": "Atlas Shrugged", "author": "Rand", "length": 1088 },
      { "_id": 4, "name": "Infinite Jest", "author": "Wallace", "length": 1104 },
      { "_id": 5, "name": "Cryptonomicon", "author": "Stephenson", "length": 918 },
-     { "_id": 6, "name": "A Dance with Dragons", "author": "Tolkein", "length": 1104 },
+     { "_id": 6, "name": "A Dance with Dragons", "author": "Martin", "length": 1104 },
    ]);
 
 Pass the following sort document to a read operation to ensure that the
@@ -49,8 +49,8 @@ documents when this sort is used with an empty query:
 .. code-block:: javascript
 
    { "_id": 2, "title": "Les Misérables", "author": "Hugo", "length": 1462 }
-   { "_id": 6, "title": "A Dance with Dragons", "author": "Martin", "length": 1104 }
    { "_id": 4, "title": "Infinite Jest", "author": "Wallace", "length": 1104 }
+   { "_id": 6, "title": "A Dance with Dragons", "author": "Martin", "length": 1104 }
    { "_id": 3, "title": "Atlas Shrugged", "author": "Rand", "length": 1088 }
    { "_id": 5, "title": "Cryptonomicon", "author": "Stephenson", "length": 918 }
    { "_id": 1, "title": "The Brothers Karamazov", "author": "Dostoyevsky", "length": 824 }