qapi: Fix up documentation for recent commit a95291007b2

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20190214152251.2073-3-armbru@redhat.com>
diff --git a/docs/devel/qapi-code-gen.txt b/docs/devel/qapi-code-gen.txt
index b91bde6..c9ba8dd 100644
--- a/docs/devel/qapi-code-gen.txt
+++ b/docs/devel/qapi-code-gen.txt
@@ -1410,6 +1410,8 @@
 
     extern const QEnumLookup example_QAPIEvent_lookup;
 
+    void example_qapi_event_emit(example_QAPIEvent event, QDict *qdict);
+
     #endif /* EXAMPLE_QAPI_EVENTS_H */
     $ cat qapi-generated/example-qapi-events.c
 [Uninteresting stuff omitted...]