cleanup, docs

site/doc/pages/str_starts_with.txt

@@ -12,7 +12,6 @@ return value : `true` when `haystack` begins with `needle`, otherwise `false`
 :content
 Checks whether `haystack` starts with `needle`.
 
-Related:
 
-- PHP: `str_starts_with()`
-- JavaScript / Node.js: `String.prototype.startsWith()`
+:example
+print(str_starts_with("/doc", "/") ? "yes\n" : "no\n");