qapi: Fix stale reference to scripts/qapi.py in a comment

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20220218145551.892787-3-armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

qapi/qapi-util.c

@@ -113,7 +113,7 @@ bool qapi_bool_parse(const char *name, const char *value, bool *obj, Error **err
  * may contain only letters, digits, hyphen and period.
  * The special exception for enumeration names is not implemented.
  * See docs/devel/qapi-code-gen.txt for more on QAPI naming rules.
- * Keep this consistent with scripts/qapi.py!
+ * Keep this consistent with scripts/qapi-gen.py!
  * If @complete, the parse fails unless it consumes @str completely.
  * Return its length on success, -1 on failure.
  */