* remove relu_backprop * Update ReLU spec * change inputs and outputs subsections of ReLU spec * Update Mathematical Formulation subsection * Update Category of ReLU in spec * Update Short description of ReLU in spec
* remove relu_backprop * Update ReLU spec * change inputs and outputs subsections of ReLU spec * Update Mathematical Formulation subsection * Update Category of ReLU in spec * Update Short description of ReLU in spec