:book: Updated documentation release steps

[Danil-Grigorev]

What this PR does / why we need it:

With the updates to the release workflow, involving the creation of PR against docs repository, we need to update release docs to reflect the change.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Special notes for your reviewer:

Checklist:

• [ ] squashed commits into logical changes
• [ ] includes documentation
• [ ] adds unit tests
• [ ] adds or updates e2e tests