DOCS-15882 Threshold typo (#2570)

Author: ianf-mongodb

source/core/sharding-balancer-administration.txt

@@ -162,7 +162,7 @@ Migration Thresholds
 
 To minimize the impact of balancing on the cluster, the
 :term:`balancer` only begins balancing after the distribution of
-date for a sharded collection has reached certain thresholds. 
+data for a sharded collection has reached certain thresholds. 
 
 A collection is considered balanced if the difference in data between 
 shards (for that collection) is less than :ref:`migration thresholds