Update URI warning in MongoReplicaSetClient.

Author: behackett

pymongo/mongo_client.py

@@ -274,8 +274,9 @@ def __init__(self, host=None, port=None, max_pool_size=10,
                 raise ConnectionFailure(str(e))
 
         if db and username is None:
-            warnings.warn("database name in URI is being ignored. if you wish to authenticate to %s, "
-                          "you must provide a username and password" % (db,))
+            warnings.warn("database name in URI is being ignored. If you wish "
+                          "to authenticate to %s, you must provide a username "
+                          "and password." % (db,))
         if username:
             db = db or "admin"
             if not self[db].authenticate(username, password):

pymongo/mongo_replica_set_client.py

@@ -433,8 +433,9 @@ def __init__(self, hosts_or_uri=None, max_pool_size=10,
             raise ConnectionFailure(str(e))
 
         if db_name and username is None:
-            warnings.warn("must provide a username and password "
-                          "to authenticate to %s" % (db_name,))
+            warnings.warn("database name in URI is being ignored. If you wish "
+                          "to authenticate to %s, you must provide a username "
+                          "and password." % (db_name,))
         if username:
             db_name = db_name or 'admin'
             if not self[db_name].authenticate(username, password):