message: Fix a grammatically incorrect in comments.
diff: @@ -516,7 +516,7 @@ class MklLayoutRewritePass : public GraphOptimizationPass {
  // Add rules to fuse sequences such as "Transpose (NCHW -> NHWC) + Conv2D
  // (NHWC) + Transpose (NHWC->
  // NCHW)" into "Conv2D (NCHW)". Such patterns occur frequently in Keras.
  - // Note: we use the term "merge" is to combine (exactly) 2 nodes into one,
  + // Note: we use the term "merge" to combine (exactly) 2 nodes into one,
  // while "fusion" is
  // for 3+ nodes situation.
  //
  