qmp-commands: move 'query-chardev-backends' 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

@@ -1690,38 +1690,6 @@ named schema entities.  Entities are commands, events and various
 types.  See docs/qapi-code-gen.txt for information on their structure
 and intended use.
 
-query-chardev-backends
--------------
-
-List available character device backends.
-
-Each backend is represented by a json-object, the returned value is a json-array
-of all backends.
-
-Each json-object contains:
-
-- "name": backend name (json-string)
-
-Example:
-
--> { "execute": "query-chardev-backends" }
-<- {
-      "return":[
-         {
-            "name":"udp"
-         },
-         {
-            "name":"tcp"
-         },
-         {
-            "name":"unix"
-         },
-         {
-            "name":"spiceport"
-         }
-      ]
-   }
-
 query-block
 -----------
 

qapi-schema.json

@@ -353,6 +353,27 @@
 # Returns: a list of @ChardevBackendInfo
 #
 # Since: 2.0
+#
+# Example:
+#
+# -> { "execute": "query-chardev-backends" }
+# <- {
+#       "return":[
+#          {
+#             "name":"udp"
+#          },
+#          {
+#             "name":"tcp"
+#          },
+#          {
+#             "name":"unix"
+#          },
+#          {
+#             "name":"spiceport"
+#          }
+#       ]
+#    }
+#
 ##
 { 'command': 'query-chardev-backends', 'returns': ['ChardevBackendInfo'] }