[#3655] Improve wording for ha-maintenance-notify

Author: msiodelski

doc/sphinx/arm/hooks-ha.rst

@@ -2285,7 +2285,7 @@ previous state. See the :ref:`ha-maintenance` section for details.
        }
    }
 
-The ``state`` argument informs the recipient about the state of this server. The
+The ``state`` argument informs the recipient about the state of the sending server. The
 recipient can instantly resume the operation of the state machine without sending
 a heartbeat to check the partner's state.
 

src/share/api/ha-maintenance-notify.json

@@ -12,7 +12,7 @@
         "that the server should transition to the in-maintenance state.",
         "If the cancel argument is set to true it instructs the server to revert from",
         "the in-maintenance state to its previous state. The state argument informs",
-        "the recipient about the state of this server.",
+        "the recipient about the state of the sending server.",
         "This command is not meant to be used by the administrator. It is",
         "merely used for internal communication between the HA partners."
     ],