message: Fix a typo in comment to mention kOutputInputYX means NCHW
diff: @@ -51,7 +51,7 @@ HeuristicLayoutAssignment(const HloInstruction* instr,
  // H <=> Y
  // W <=> X
  //
  - // Therefore kOutputInputYX means NHWC; kBatchDepthYX means NCHW.
  + // Therefore kOutputInputYX and kBatchDepthYX mean NCHW.
  // As of today, our empirical evidence is that cudnn 7.0 is faster on V100 x
  // fp16 with the mostly-NHWC layout. The heuristic may change as cudnn version
  