Fix command hint to generate a config file

AUTHORS.rst

@@ -65,4 +65,7 @@ Pierre Jaury <pierre at jaury.eu>
 * Docker packaging
 
 Serban Constantin <serban.constantin at gmail dot com>
- * Small bug fix
+ * Small bug fix
+
+Jason Robinson <jasonr at matrix.org>
+ * Minor fixes

changelog.d/4353.misc

@@ -0,0 +1 @@
+Fix command hint to generate a config file when trying to start without a config file

synctl

@@ -156,7 +156,9 @@ def main():
         write(
             "No config file found\n"
             "To generate a config file, run '%s -c %s --generate-config"
-            " --server-name=<server name>'\n" % (" ".join(SYNAPSE), options.configfile),
+            " --server-name=<server name> --report-stats=<yes/no>'\n" % (
+                " ".join(SYNAPSE), options.configfile,
+            ),
             stream=sys.stderr,
         )
         sys.exit(1)