cleanup, docs

site/doc/pages/file_exists.txt

@@ -11,7 +11,5 @@ return value : true if the file exists
 :content
 Checks whether the file or path specified by `path` exists.
 
-## Related Concepts
-
-- PHP: `file_exists()` or `is_file()`
-- JavaScript / Node.js: Node `fs.existsSync()` or `fs.stat()`
+:example
+print("file_exists example\n");