[mod] search-syntax.md: add tutorial about the feeling lucky feature

searx/infopage/en/search-syntax.md

@@ -33,7 +33,7 @@ To select language filter use a `:` prefix.  To give an example:
 
   - {{search(':fr !wp Wau Holland')}}
 
-## `!!` external bangs
+## `!!<bang>` external bangs
 
 SearXNG supports the external bangs from [DuckDuckGo].  To directly jump to a
 external search page use the `!!` prefix.  To give an example:
@@ -47,6 +47,20 @@ engine, SearXNG cannot protect your privacy on this.
 
 [DuckDuckGo]: https://duckduckgo.com/bang
 
+## `!!` automatic redirect
+
+When mentioning `!!` within the search query (separated by spaces), you will
+automatically be redirected to the first result.  This behavior is comparable to
+the "Feeling Lucky" feature from DuckDuckGo.  To give an example:
+
+- search for a query and get redirected to the first result
+
+  - {{search('!! Wau Holland')}}
+
+Please keep in mind that the result you are being redirected to can't become
+verified for being trustworthy, SearXNG cannot protect your personal privacy
+when using this feature.  Use it at your own risk.
+
 ## Special Queries
 
 In the {{link('preferences', 'preferences')}} page you find keywords for