Updated reStructuredText Primer link

[Owslla]

The current URL in the documentation does not function. Replaced with the current URL to the related primer.

☑️ Resolves

• Not related to a specific issue.
• Fix: Broken link to the ReStructuredText Primer page.

🖼️ Screenshots

The appearance is the same. Only the URL was altered.

[Owslla]

I searched and did not see an Issue related to this. Should I create an issue first, then do a pull request against that? I greatly appreciate your guidance.

[Owslla]

I had the same thought about linking to the parent, but went with one that matched the original, since I didn't know about any past rational.

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