Fix broken links to Git book

[mergenci]

Reasons for making this change:

I found that one of the links to the Git book was broken. I wanted to fix it.

Links to documentation supporting these rule changes:

Old link was broken: https://git-scm.com/book/en/Git-Basics-Recording-Changes-to-the-Repository#_ignoring

New link is working: https://git-scm.com/book/en/v2/Git-Basics-Recording-Changes-to-the-Repository#_ignoring

If this is a new template:

• Link to application or project’s homepage: None