RFR: Section on backporting

[David Holmes]

On Sat, 20 Nov 2021 02:03:51 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> Guidance on backporting.
> Also moved "Backing out a change" to the testing section where I believe it fits better. This section is unchanged.

Hi Jesper,

Changes seem reasonable to me.

Thanks,
David

src/index.md line 1450:

> 1448: ### How to work with mercurial when a change is backed out
> 1449: 
> 1450: In order to backout a change, the `hg backout` command is recommended, which essentially applies the anti-delta of the change. Make sure you perform the backout in the most upstream repostiory the change has escaped to.

typo: repostiory

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Marked as reviewed by dholmes (Author).

PR: https://git.openjdk.java.net/guide/pull/66