Fix

Author: mcmorisi

source/indexes/atlas-search-index.txt

@@ -67,7 +67,7 @@ The following code example shows how to create multiple indexes:
    :end-before: end-create-search-indexes
    :dedent:
 
-To learn more about the syntax used when defining Atlas Search indexes, see the
+To learn more about the syntax used to define Atlas Search indexes, see the
 :atlas:`Review Atlas Search Index Syntax </atlas-search/index-definitions>` guide
 in the Atlas manual.