Update Snippet repo stor. moves API page based on initial review

Issue description

This page describes product documentation work that was identified during a documentation review of documentation pages associated with the Create:Editor stage/group.

Page: https://docs.gitlab.com/ee/api/snippet_repository_storage_moves.html

Identified items

• Should cross-link from https://docs.gitlab.com/ee/api/snippet_repository_storage_moves.html to https://docs.gitlab.com/ee/user/snippets.html and vice versa.