RFR: Section on backporting [v2]

[Jesper Wilhelmsson]

On Mon, 22 Nov 2021 02:42:15 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fixes after reviews
>
> 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

Thank you for reviewing! Fixed the typo.

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