[mlir][sparse] fix typos in integration tests

Reviewed By: bixia, wrengr

Differential Revision: https://reviews.llvm.org/D114820

mlir/test/Integration/Dialect/SparseTensor/CPU/sparse_out_reduction.mlir

@@ -67,7 +67,6 @@ module {
     %st2 = sparse_tensor.convert %t2
       : tensor<3x3x4xi32> to tensor<?x?x?xi32, #SparseTensor>
 
-
     // Call kernel.
     %0 = call @redsum(%st1, %st2)
       : (tensor<?x?x?xi32, #SparseTensor>,

mlir/test/Integration/Dialect/SparseTensor/CPU/sparse_out_simple.mlir

@@ -36,7 +36,7 @@
     affine_map<(i,j) -> (i,j)>  // X (out)
   ],
   iterator_types = ["parallel", "parallel"],
-  doc = "X(i,j) += X(i,j) * X(i,j)"
+  doc = "X(i,j) *= X(i,j)"
 }
 
 //