Update documentation badge from wiki to HTML (#1143)

Since the docs no longer point at a wiki

Author: simonbyrne

README.md

@@ -2,7 +2,7 @@
 
 [![GitHub Releases](https://img.shields.io/github/v/release/NVIDIA/MatX)](https://github.com/NVIDIA/MatX/releases/)
 [![GitHub License](https://img.shields.io/badge/license-BSD-green)](https://github.com/NVIDIA/MatX/blob/main/LICENSE)
-[![GitHub Documentation](https://img.shields.io/badge/wiki-documentation-forestgreen)](https://nvidia.github.io/MatX)
+[![GitHub Documentation](https://img.shields.io/badge/html-documentation-forestgreen)](https://nvidia.github.io/MatX)
 [![Coverage Status](https://coveralls.io/repos/github/NVIDIA/MatX/badge.svg?branch=main)](https://coveralls.io/github/NVIDIA/MatX?branch=main)
 
 **MatX** is a modern C++ library for numerical computing on NVIDIA GPUs and CPUs. Near-native performance can be achieved while using a simple syntax common in higher-level languages such as Python or MATLAB.