Update to edit a sentence into bullet points

For easier reading.

Co-authored-by: Ian James <[email protected]>

source/standards/source-code/working-with-git.html.md.erb

@@ -33,8 +33,13 @@ You can configure some CI systems to check out the default branch rather than ha
 
 ### Atomic commits
 
-Each commit should be atomic, meaning that each commit should only include changes that achieve a given, granular, step.
-They should also be logical steps that follow each other. As Anna Shipman describes it,
+Each commit should be atomic - this means that each commit:
+
+* is self-contained
+* only includes changes that achieve a specific step
+* should be in a logical order
+
+As Anna Shipman describes it,
 [they should tell a story](https://www.annashipman.co.uk/jfdi/good-pull-requests.html#make-the-pull-request-tell-a-story).
 
 ### Commit messages