Add basic documentation for multi node training (#1988)
* initial commit for adding multinode training doc
* removed stray changes
* fix formatting issue and switch to bulleted list
* Update docs/source/basic_tutorials/launch.md
Co-authored-by: Zach Mueller <muellerzr@gmail.com>
* Update docs/source/basic_tutorials/launch.md
Co-authored-by: Zach Mueller <muellerzr@gmail.com>
* added link to new blog post
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Co-authored-by: Zach Mueller <muellerzr@gmail.com>
