Merge pull request #2187 from kstirman/patch-17

Update production-notes.txt

Author: mpaik

source/administration/production-notes.txt

@@ -68,7 +68,7 @@ WiredTiger
 
 WiredTiger supports concurrent access by readers and writers to the
 documents in a collection. Clients can read documents while write
-operations are in progress, and two clients can modify different
+operations are in progress, and multiple clients can modify different
 documents in a collection at the same time.
 
 In most respects, recommendations for managing production MongoDB