Update doc monthly release process

Why is this change being made?

While working through the TW lead duties for 14.3, I had a couple of pipeline failures while cutting the docs release. This MR adds some troubleshooting steps to this page in case the next TW lead encounters the same issues.

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
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• If the changes affect team members, or warrant an announcement in another way, please consider posting an update in #whats-happening-at-gitlab linking to this MR.
  • If this is a change that directly impacts the majority of global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.

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