fixed the code in matrix multiplication in docs/datastructure.rst line number: 442

Author: RaviTejaKomma

docs/datastructure.rst

@@ -439,7 +439,7 @@ In this example we will multiply two matrices. First we will take input the numb
         b.append([int(x) for x in input("").split(" ")])
     c = []
     for i in range(0, n):
-        c.append([a[i][j] * b[j][i] for j in range(0, n)])
+        c.append([ sum([a[i][k] * b[k][j] for k in range(0, n)]) for j in range(0,n) ])
     print("After matrix multiplication")
     print("-" * 10 * n)
     for x in c: