docs: clarify that `matmul`, etc. are not summary ops (#3681)
docs: clarify that `matmul`, etc. are not summary ops (#3681)

When I first read, it sounded as if matmult was a summary operator.  adding 'just' and 'and', I feel, makes all the difference.
tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard