fix(code snippet): Added a missing "f" for an f-string usedin the code snippet (#6222)

The last line in the code snippet was missing the 'f' before the double quotes, causing the statement not to print.

Author: Sulai-maan

content/python/concepts/collections-module/terms/Counter/Counter.md

@@ -47,5 +47,5 @@ import collections
 c = collections.Counter("supercalifragilisticexpialidocious")
 print(f"Counter Collection: {c}\n")
 print(f"Sorted: {sorted(c.elements())}\n")
-print("5 Most Common Items: {c.most_common(5)}")
+print(f"5 Most Common Items: {c.most_common(5)}")
 ```