Make the page easy to comprehend

[network-charles]

• The word "development" used in this sentence, "This is a very small guide to help with the development of this extension." made me think that this page was focused on contributors who are interested in improving the features of this extension. It wasn't until someone told me that the page is focused on how to test the extension in my development environment. I've updated the word.
• I also changed "existent" to an easier word, "existing".
• In this sentence, "The project and version has" project and version are two nouns, so using the verb "has" is wrong.
• I updated the link to installing Read the Docs locally to the latest URL.

---

📚 Documentation preview 📚: https://sphinx-hoverxref--333.org.readthedocs.build/en/333/

[humitos]

Hi! Thanks for your collaboration. We are not spending too much time in this extension anymore since it was integrated directly into the product as "Links preview": https://docs.readthedocs.com/platform/stable/link-previews.html

Now, it works for any documentation tool, not just Sphinx.

Due to this, we plan to archive this repository soon.

[network-charles]

Oh, nice! Thanks for the clarification.