qmp-commands: move 'block_resize' 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

@@ -169,22 +169,6 @@ Example:
 <- { "return": { "status": "active", "completed": 1024000,
                  "total": 2048000 } }
 
-block_resize
-------------
-
-Resize a block image while a guest is running.
-
-Arguments:
-
-- "device": the device's ID, must be unique (json-string)
-- "node-name": the node name in the block driver state graph (json-string)
-- "size": new size
-
-Example:
-
--> { "execute": "block_resize", "arguments": { "device": "scratch", "size": 1073741824 } }
-<- { "return": {} }
-
 block-stream
 ------------
 

qapi/block-core.json

@@ -999,6 +999,13 @@
 #          If @device is not a valid block device, DeviceNotFound
 #
 # Since: 0.14.0
+#
+# Example:
+#
+# -> { "execute": "block_resize",
+#      "arguments": { "device": "scratch", "size": 1073741824 } }
+# <- { "return": {} }
+#
 ##
 { 'command': 'block_resize', 'data': { '*device': 'str',
                                        '*node-name': 'str',