docs: fix typos and improve description in anagrams.py

Added a brief definition of what an anagram is in the docstring to make the documentation clearer for beginners.

Author: Fauzanhandriansyah

strings/anagrams.py

@@ -24,7 +24,11 @@ def signature(word: str) -> str:
 
 def anagram(my_word: str) -> list[str]:
     """
+    An anagram is a word or phrase formed by rearranging the letters of a different
+    word or phrase, typically using all the original letters exactly once.
+    
     Return every anagram of the given word from the dictionary.
+    
 
     >>> anagram('test')
     ['sett', 'stet', 'test']