docs(FigmaTemplate): add optional create version step

What

Adds a step to create a named version in the history as part of the review request process

Why

In a discussion with @lvanc we commented how it was easy to make unintentional changes while reviewing Figma files. We wondered if adding a version to the version history would help.

This MR adds it as a deliberate step the the review process.

Having a named version allows:

• a fixed point to revert to if unintentional changes are made to the file
• reviewers to revert after testing changes in the file
• confidence that no changes have been made after review but before merge