Documentation: Rework staging and commit information

This patch does two things:
- The CLI and Git Cola sections contained some duplicated information
  about pushing patches, which is now factored out into its own section.
- The draft workflow is now disabled, so that part has been reworded to
  describe how to submit a private patch.

Signed-off-by: David Hendricks <david.hendricks@gmail.com>
Change-Id: I562c101ab2ee78d901be7e99165daba7473dc3c1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37256
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

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