RFR: Clearly state that users should create branch [v3]

[Alexey Ivanov]

On Mon, 23 Jan 2023 13:14:05 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> A recent PR submission to the JDK made me aware that the guide does not strongly enough emphasize the importance of creating a separate branch. 
>> 
>> (If you do put your changes directly in `master`, the Skara bots will put up harsh warnings, which is not a nice way to welcome someone who has tried to do everything right, including reading the guide)
>
> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Try different wording

Marked as reviewed by aivanov (no project role).

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PR: https://git.openjdk.org/guide/pull/94