Update source/administration/sharded-clusters.txt

Author: kstirman

source/administration/sharded-clusters.txt

@@ -12,7 +12,7 @@ consists of the following components:
 
 - :ref:`Shards <sharding-shards>`. Each shard is a separate
   :program:`mongod` instance or :term:`replica set` that holds a portion
-  of the your database collections.
+  of the database collections.
 
 - :ref:`Config servers <sharding-config-server>`. Each config server is
   a :program:`mongod` instances that holds metadata about the cluster.