qmp-commands: move 'quit' 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

@@ -53,18 +53,6 @@ If you're planning to adopt QMP, please observe the following:
 Server's responses in the examples below are always a success response, please
 refer to the QMP specification for more details on error responses.
 
-quit
-----
-
-Quit the emulator.
-
-Arguments: None.
-
-Example:
-
--> { "execute": "quit" }
-<- { "return": {} }
-
 eject
 -----
 

qapi-schema.json

@@ -2120,6 +2120,11 @@
 # unexpected.
 #
 # Since: 0.14.0
+#
+# Example:
+#
+# -> { "execute": "quit" }
+# <- { "return": {} }
 ##
 { 'command': 'quit' }