Fixed typos in two files (#898)

Co-authored-by: rahulrameshan <[email protected]>

Author: joseph-alan-jose

CONTRIBUTING.md

@@ -11,7 +11,7 @@ agree to abide by the [Code of Conduct](CODE_OF_CONDUCT.md).
 
 * After that create a branch for your changes. For example:  
   * add_XXX if you will add new algorithms or data structures.  
-  * fix_XXX if you will fixe a bug on a certain algorithm or data structure.  
+  * fix_XXX if you will fix a bug on a certain algorithm or data structure.  
   * test_XXX if you wrote a test/s.  
   * doc_XXX if you added to or edited documentation.
 

algorithms/matrix/matrix_exponentiation.py

@@ -1,6 +1,6 @@
 def multiply(matA: list, matB: list) -> list:
     """
-    Multiplies two square matrices matA and matB od size n x n
+    Multiplies two square matrices matA and matB of size n x n
     Time Complexity: O(n^3)
     """
     n = len(matA)