RFR: 8251549: Update docs on building for Git

Sat Sep 5 20:40:29 UTC 2020

On Sat, 5 Sep 2020 20:13:18 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> 8251549: Update docs on building for Git

Hi Joe,  This looks OK.    Are similar changes being made to  http://openjdk.java.net/guide/producingChangeset.html as
well given it refers to mercurial?

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Marked as reviewed by lancea (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/21