WIP: Update rebase doc

[soltysh]

No description provided.

[openshift-ci-robot]

@soltysh: the contents of this pull request could not be automatically validated.

The following commits could not be validated and must be approved by a top-level approver:

• 20e4714|Update rebase doc: does not specify an upstream backport in the commit message

[openshift-ci]

@soltysh: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/verify-commits	20e4714	link	/test verify-commits
ci/prow/verify	20e4714	link	/test verify
ci/prow/e2e-agnostic-cmd	20e4714	link	/test e2e-agnostic-cmd

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[soltysh]

/close
already included in #641

[openshift-ci-robot]

@soltysh: Closed this PR.

In response to this:

/close
already included in #641

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