Add missing autocomplete backends to settings.yml comment

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/settings.yml

@@ -4,7 +4,7 @@ general:
 
 search:
     safe_search : 0 # Filter results. 0: None, 1: Moderate, 2: Strict
-    autocomplete : "" # Existing autocomplete backends: "dbpedia", "duckduckgo", "google", "startpage", "wikipedia" - leave blank to turn it off by default
+    autocomplete : "" # Existing autocomplete backends: "dbpedia", "duckduckgo", "google", "startpage", "swisscows", "qwant", "wikipedia" - leave blank to turn it off by default
     default_lang : "" # Default search language - leave blank to detect from browser information or use codes from 'languages.py'
     ban_time_on_fail : 5 # ban time in seconds after engine errors
     max_ban_time_on_fail : 120 # max ban time in seconds after engine errors