contributor-guide: submit-changes: make "Crediting contributors" part of "Commit your changes"

There's no need to differentiate crediting contributors from committing
your changes, so let's simply make it the last step of "Commit your
changes" section.

This simply indents the text so it's now part of "Commit your changes"
list instead of the main list in the "Implement and commit changes"
section. Because of this reorganisation, the instruction to use "git
commit --amend" to add the contributors is moved to a note, and the
first few sentences are reworded to better match the wording of other
items in the "Commit your changes" list of instructions.

(From yocto-docs rev: eff4d14e28d323ebfdaeb0c5c805b5f1e2ad153d)

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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