doc: architecture minor fixes in watch notify

Signed-off-by: Abhishek Lekshmanan <[email protected]>

doc/architecture.rst

@@ -1185,9 +1185,9 @@ Object Watch/Notify
 -------------------
 
 A client can register a persistent interest with an object and keep a session to
-the primary OSD open. The client can send a notification message and payload to
+the primary OSD open. The client can send a notification message and a payload to
 all watchers and receive notification when the watchers receive the
-notification. This enables a client to use any object a
+notification. This enables a client to use any object as a
 synchronization/communication channel.
 
 
@@ -1597,4 +1597,4 @@ instance for high availability.
 .. _Set Pool Values: ../rados/operations/pools#set-pool-values
 .. _Kerberos: http://en.wikipedia.org/wiki/Kerberos_(protocol)
 .. _Cephx Config Guide: ../rados/configuration/auth-config-ref
-.. _User Management: ../rados/operations/user-management
+.. _User Management: ../rados/operations/user-management