Resolve "Create documentation for running gdk reset-data"

What does this Merge Request do?

⚠ This MR relies upon !1844 (merged).

This MR creates the necessary documentation for running gdk reset-data.

Merge Request checklist

• Tests added for new functionality. If not, please raise Issue to follow-up.
• This change is backward compatible. If not, please include steps to communicate to our users.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.

Closes #1172 (closed)