RFR: Section on cloning [v9]

[Iris Clark]

On Sun, 22 Aug 2021 23:34:02 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Added a section on cloning from GitHub, and an example of building on Mac. Also fixed two minor bugs that caused problems with syntax highlighting in Atom.
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Personal clone

src/index.md line 1466:

> 1464:     +-----------------+
> 1465: 
> 1466: The `~/.ssh/id_rsa.pub` is a text file containing the public ssh key. This file should be mailed as an attachment along with the JDK username to [keys(at)openjdk.java.net](mailto:keys-at-openjdk.java.net). An administrator will install your key on the server and notify you on completion. This process may take a couple of days.

I'm not sure how to handle this.  All of the new section is about using Git; however, these instructions for sending to keys at ojn are still needed for the very few Projects which still develop using hg.ojn or for those intending to use cr.ojn.  I referenced them in the past few weeks when helping a user so I'm reluctant to completely eliminate these few sentences quite yet.

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PR: https://git.openjdk.java.net/guide/pull/59