fix: List rendering broken due missing blank lines (microsoft#1018)

MkDocs expects documents conform to

- MD032 - Lists should be surrounded by blank lines

in markdownlint speak.

Co-authored-by: Shiran Rubin <shiranrubin@microsoft.com>
Co-authored-by: Tess Ferrandez <tferrand@microsoft.com>

Author: 3 people

docs/source-control/git-guidance/README.md

@@ -252,6 +252,7 @@ git config --global core.editor "code --wait"
 ### Commit Message Structure
 
 The essential parts of a commit message are:
+
 * subject line: a short description of the commit, maximum 50 characters long
 * body (optional): a longer description of the commit, wrapped at 72 characters, separated from the subject line by a blank line