Update the auto-deploy branch creation cadence
Why is this change being made?
We are increasing the frequency of creating the branches for deployment to gitlab.com with gitlab-com/gl-infra/delivery#627 (closed) . This updates the release handbook page to reflect the status.
Does this MR meet the acceptance criteria?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what