Remove spurious "the"

Author: matthurne

source/applications/aggregation.txt

@@ -237,7 +237,7 @@ Sharded Operation
 
    .. versionchanged:: 2.1
 
-   Some aggregation operations using the :dbcommand:`aggregate` will
+   Some aggregation operations using :dbcommand:`aggregate` will
    cause :program:`mongos` instances to require more CPU resources
    than in previous versions. This modified performance profile may
    dictate alternate architecture decisions if you make use the