Some broken links about maintaining git and libgit2

[francilioaraujo]

There's no existing/similar bug report.

• I have searched the existing issues

This report is about a single actionable bug.

• I'm reporting a single actionable bug

This report is about the ProGit book, version 2, English language.

• This bug is not about a translation or old version

Bug covers book website/pdf

• I confirm the bug is about the book as found on the website/pdf

Problem is present in the Pro Git book on the website?

• This bug also affects the Pro Git book as published on the website.

Which version of the book is affected?

Source files

Describe the bug:

Some links are broken.

5.3 Distributed Git - Maintaining a Project: The link https://github.com/git/git/blob/master/Documentation/howto/maintain-git.txt should be https://github.com/git/git/blob/master/Documentation/howto/maintain-git.adoc

A2.2 Appendix B: Embedding Git in your Applications - Libgit2: The links https://libgit2.github.com/libgit2 and https://libgit2.github.com/docs use the old domain. Perhaps they should be changed to https://libgit2.org/docs/reference/main/ and https://libgit2.org/docs/

Steps to reproduce:

NA

Expected behavior:

The links should go to the right pages

Screenshots:

No response

Additional context:

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Device

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Operating system

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Browser/application + version

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