Tabs to spaces

Author: haampie

docs/src/examples/matrix_multiplication.md

@@ -6,12 +6,12 @@ LoopVectorization currently doesn't do any memory-modeling or memory-based optim
 We can write a single function:
 ```julia
 function A_mul_B!(C, A, B)
-	@avx for n ∈ indices((C,B), 2), m ∈ indices((C,A), 1)
+    @avx for n ∈ indices((C,B), 2), m ∈ indices((C,A), 1)
         Cmn = zero(eltype(C))
         for k ∈ indices((A,B), (2,1))
             Cmn += C[m,k] * B[k,n]
         end
-		C[m,n] = Cmn
+        C[m,n] = Cmn
     end
 end
 ```