Typo in comment rabin_karp.py (TheAlgorithms#1820)

* Update rabin_karp.py

fix: typo

* Update rabin_karp.py

Co-authored-by: Christian Clauss <cclauss@me.com>

Author: emirot

strings/rabin_karp.py

@@ -40,7 +40,7 @@ def rabin_karp(pattern, text):
             return True
         if i == t_len - p_len:
             continue
-        # Calculating the ruling hash
+        # Calculate the https://en.wikipedia.org/wiki/Rolling_hash
         text_hash = (
             (text_hash - ord(text[i]) * modulus_power) * alphabet_size
             + ord(text[i + p_len])