[fix] correct comment in settings.yml for value to disable scheduling (#5052)

settings.yml correct value to disable scheduling

searx/settings.yml

@@ -277,7 +277,7 @@ checker:
   # disable checker when in debug mode
   off_when_debug: true
 
-  # use "scheduling: false" to disable scheduling
+  # use "scheduling: {}" to disable scheduling
   # scheduling: interval or int
 
   # to activate the scheduler: