Removed duplicate word

Author: jyemin

source/release-notes/2.2.txt

@@ -20,7 +20,7 @@ Preparation
 ~~~~~~~~~~~
 
 If your MongoDB deployment uses authentication, upgrade your drivers
-(i.e. client libraries) and and :program:`mongos` instances before
+(i.e. client libraries) and :program:`mongos` instances before
 upgrading your :program:`mongod` instances.
 
 .. TODO insert the following line if we eventually have a section on