Update source/core/sharded-clusters.txt

Author: kstirman

source/core/sharded-clusters.txt

@@ -92,8 +92,8 @@ Shard Balancing
 ---------------
 
 Balancing is the process MongoDB uses to redistribute data within a
-:term:`sharded cluster`. When a :term:`shard` has a too many:
-term:`chunks <chunk>` when compared to other shards, MongoDB
+:term:`sharded cluster`. When a :term:`shard` has a too many
+:term:`chunks <chunk>` when compared to other shards, MongoDB
 automatically balances the shards. MongoDB balances the shards without
 intervention from the application layer.