Documentation Link

No response

Problem

In running link checker for the 3.10 release, I found a dead link with the original resource appearing to no longer exist:

doc/devel/development_workflow.rst
146:.. _why the -a flag?:http://gitready.com/beginner/2009/01/18/the-staging-area.html

Suggested improvement

There are probably a number of reasonable alternatives, my leaning though I have not evaluated other alternatives would probably be to replace it with the git official website link about the staging area

https://git-scm.com/about/staging-area

It is not that overwhelmingly detailed, but does have a "if you don't want the full control just use-a" which is the main point of the link I think.

Not sure if there are more beginner focused resources that we may prefer (The previous link did have 'beginner' in the URL, but I do not know what the contents of the page were)