Fix code blocks rendering in setup instructions
Fix code blocks rendering in setup instructions

The code blocks in lists explicitly need the ``` to indicate they are
code. Else, they are rendered as a paragraph.

Test: Tested the rendering in gitiles
Change-Id: Icb93c4ecebfe1b268ac839f6db73fddb22845b14

AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx