qmp-commands: move 'ringbuf-write' 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

@@ -334,26 +334,6 @@ Example:
 
 Note: inject-nmi fails when the guest doesn't support injecting.
 
-ringbuf-write
--------------
-
-Write to a ring buffer character device.
-
-Arguments:
-
-- "device": ring buffer character device name (json-string)
-- "data": data to write (json-string)
-- "format": data format (json-string, optional)
-          - Possible values: "utf8" (default), "base64"
-
-Example:
-
--> { "execute": "ringbuf-write",
-                "arguments": { "device": "foo",
-                               "data": "abcdefgh",
-                               "format": "utf8" } }
-<- { "return": {} }
-
 ringbuf-read
 -------------
 

qapi-schema.json

@@ -410,6 +410,15 @@
 # Returns: Nothing on success
 #
 # Since: 1.4
+#
+# Example:
+#
+# -> { "execute": "ringbuf-write",
+#      "arguments": { "device": "foo",
+#                     "data": "abcdefgh",
+#                     "format": "utf8" } }
+# <- { "return": {} }
+#
 ##
 { 'command': 'ringbuf-write',
   'data': {'device': 'str', 'data': 'str',