Auto merge of #5684 - bundler:colby/setup-doc-formatting, r=segiddins
Auto merge of #5684 - bundler:colby/setup-doc-formatting, r=segiddins

SETUP.md: add markdown code blocks to shell commands

bundler/bundler,mvz/bundler,dilumnavanjana/bundler,dilumnavanjana/bundler,bundler/bundler,mvz/bundler