Update remaining snippets

snippets/unique_elements.md

@@ -1,14 +1,15 @@
 ---
 title: unique_elements
-tags: list
+tags: list,beginner
 ---
+
 Returns the unique elements in a given list.
 
-The given `list` is first converted to a `set` using the `set()` function. By definition, a `set` cannot have duplicate elements. So, the duplicate elements are automatically removed. Before returning, we convert it back to a `list`
+Create a `set` from the list to discard duplicated values, then return a `list` from it.
 
 ```py
 def unique_elements(li):
-    return list(set(li))
+  return list(set(li))
 ```
 
 ```py