Merge branch 'docs-update-date-last-change' into 'master'

Docs: update last update metadata

See merge request gitlab-org/gitlab!35680

doc/gitlab-basics/start-using-git.md

 ---
 type: howto, tutorial
 description: "Introduction to using Git through the command line."
-last_updated: 2020-04-22
+last_updated: 2020-06-30
 ---
 
 # Start using Git on the command line