qapi: Slightly clearer error message for invalid "Returns" section

Change "'Returns:' is only valid for commands" to "'Returns' section
is only valid for commands".

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240227113921.236097-3-armbru@redhat.com>

scripts/qapi/parser.py

@@ -716,8 +716,9 @@ def connect_feature(self, feature: 'QAPISchemaFeature') -> None:
 
     def check_expr(self, expr: QAPIExpression) -> None:
         if self.returns and 'command' not in expr:
-            raise QAPISemError(self.returns.info,
-                               "'Returns:' is only valid for commands")
+            raise QAPISemError(
+                self.returns.info,
+                "'Returns' section is only valid for commands")
 
     def check(self) -> None:
 

tests/qapi-schema/doc-invalid-return.err

@@ -1 +1 @@
-doc-invalid-return.json:6: 'Returns:' is only valid for commands
+doc-invalid-return.json:6: 'Returns' section is only valid for commands