qmp-commands: move 'balloon' doc to schema

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

docs/qmp-commands.txt

@@ -1074,20 +1074,6 @@ Arguments:
 Returns: Nothing on success
          If "device" does not exist or cannot be determined, DeviceNotFound
 
-balloon
--------
-
-Request VM to change its memory allocation (in bytes).
-
-Arguments:
-
-- "value": New memory allocation (json-int)
-
-Example:
-
--> { "execute": "balloon", "arguments": { "value": 536870912 } }
-<- { "return": {} }
-
 getfd
 -----
 

qapi-schema.json

@@ -2379,6 +2379,12 @@
 #        size independent of this command.
 #
 # Since: 0.14.0
+#
+# Example:
+#
+# -> { "execute": "balloon", "arguments": { "value": 536870912 } }
+# <- { "return": {} }
+#
 ##
 { 'command': 'balloon', 'data': {'value': 'int'} }