Improved a comment

Author: RuchitJagodara

src/sage/matrix/matrix2.pyx

@@ -18670,7 +18670,7 @@ def _matrix_power_symbolic(A, n):
         if hasattr(mk, 'radical_expression'):
             mk = mk.radical_expression()
 
-        # Return mk^(n-i) instead of mk**(n-i) if mk=0
+        # If mk=0 return mk^(n-i) instead of mk**(n-i)
         if mk:
             vk = [(binomial(n, i) * mk._pow_(n-i)).simplify_full()
                   for i in range(nk)]