Typo in comment rabin_karp.py
diff --git a/strings/rabin_karp.py b/strings/rabin_karp.py
index 1fb145ec97fa..22da0de80f4c 100644
--- a/strings/rabin_karp.py
+++ b/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])

fix: typo

### **Describe your change:**


* [X] Fix a bug or typo in an existing algorithm?

### **Checklist:**
* [X] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Python/blob/master/CONTRIBUTING.md).
* [X] This pull request is all my own work -- I have not plagiarized.
* [X] I know that pull requests will not be merged if they fail the automated tests.
* [X] This PR only changes one algorithm file.  To ease review, please open separate PRs for separate algorithms.
* [X] All new Python files are placed inside an existing directory.
* [X] All filenames are in all lowercase characters with no spaces or dashes.
* [X] All functions and variable names follow Python naming conventions.
* [X] All function parameters and return values are annotated with Python [type hints](https://docs.python.org/3/library/typing.html).
* [X] All functions have [doctests](https://docs.python.org/3/library/doctest.html) that pass the automated testing.
* [X] All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
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