This change also updates version of git documentation to match one used in
depot_tools, asciidoc, and ansi2html. It also fixes reset signal.

R=gavinmak@google.com

Bug: 1357152
Change-Id: I998e7434dde8d82b491376b47a5993c6d91d64a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3856830Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>