RR feedback

Author: mcmorisi

source/indexes.txt

@@ -78,7 +78,7 @@ that you track index memory and disk usage for capacity planning. In addition,
 when a write operation updates an indexed field, MongoDB updates the related
 index.
 
-Since MongoDB supports dynamic schemas, applications can query against fields whose names cannot be known in advance or
+Since MongoDB supports dynamic schemas, applications can query against fields whose names you don't know in advance or
 are arbitrary. :manual:`Wildcard indexes </core/index-wildcard/>` help support these queries, but
 are not designed to replace workload-based index planning.