removed tab from empty line for check fail

content/cpp/concepts/unordered-map/terms/bucket/bucket.md

@@ -21,7 +21,7 @@ size_type bucket(const key_type& k) const;
 ```
 
 - `key`: The key whose bucket number needs to be found in the unordered map.
-  
+
 The function returns a `size_type` value, representing the zero-indexed bucket number where the specified key is stored.
 
 ## Example