Documentation: Link reviews more explanation in all chapters

Description of change

Following feedback about learning Stax, I've clarified the documentation about Link Reviews in all parts it's mentionned.

How to test it

Read:

• https://superprod.gitlab.io/-/stax_suite/stax/-/jobs/1047047207/artifacts/docs/build/html/getting_started.html#long-term
• https://superprod.gitlab.io/-/stax_suite/stax/-/jobs/1047047207/artifacts/docs/build/html/user/technical_director/index.html#handle-reviews
• https://superprod.gitlab.io/-/stax_suite/stax/-/jobs/1047047207/artifacts/docs/build/html/features/link_reviews.html#link-reviews

Checklist

Please check if your MR fulfills the following requirements:

• Unit tests have been added, if needed
• Documentation have been updated, if needed
• Build was run locally and any changes were pushed
• Lint has passed locally without error
• Package.py have been updated, if needed
• CHANGELOG.md have been updated, if needed

FYI: @awesome_dev_too