Improve section about query modifiers a little more.

source/core/sharded-cluster-query-router.txt

@@ -89,11 +89,11 @@ cursors on the shards.
    In versions prior to 2.0.5, the :program:`mongos` exhausted each
    cursor, one by one.
 
-If the queries specifies sorted results using the
+If the query specifies sorted results using the
 :method:`~cursor.sort()` cursor method, the :program:`mongos` instance
 passes the :operator:`$orderby` option to the shards. When the
-:program:`mongos` receives results it performs a *merge sort* of the
-results.
+:program:`mongos` receives results it performs an incremental *merge sort* 
+of the results while returning them to the client.
 
 If the query limits the size of the result set using the
 :method:`~cursor.limit()` cursor method, the :program:`mongos`
@@ -102,7 +102,8 @@ to the result before returning the result to the client.
 
 If the query specifies a number of records to *skip* using the
 :method:`~cursor.skip()` cursor method, the :program:`mongos` *cannot*
-pass the skip to the shards, and trims the result set when assembling
+pass the skip to the shards, but rather retrieves unskipped results
+from the shards and skips the appropriate number of documents when assembling
 the complete result. However, when used in conjunction with a
 :method:`~cursor.limit()`, the :program:`mongos` will pass the *limit*
 plus the value of the :method:`~cursor.skip()` to the shards to