[Docs] Document how links to other pages should be formatted

[hramos]

Should clients update all their links?

React Native's links are in the following format:

[Tutorial](docs/tutorial.html)

This is resulting in broken links to docs/docs/tutorial.html. I fixed it by updating the link to

[Tutorial](Tutorial.md)

This is sort of documented in the basics example, in doc2.md, but it could be more obvious (maybe as part of Preparing your Site).

[ppatel221]

Hey I'm a student in an open source development class. Can i help with this bug?

[JoelMarcey]

@ppatel221 Hi! Absolutely. Please send a pull request. We would be happy to review it.

[JoelMarcey]

...and if afterwards (or in parallel) you want something code related and related to this issue, there is #257 as well.

[ppatel221]

I can also take a look at that bug! Can you help me get started with this? What would be my first step

[JoelMarcey]

@ppatel221 I wold start by reading the contributing documentation. That should help you get oriented on how to generally make pull requests for this project.

[ppatel221]

I've requested PR for one of the links I updated. Are there more places that need these updates?
#366

[ppatel221]

Ive requested a PR here as well reactjs/react.dev#478

[alexkrolick]

@ppatel221 ReactJS doesn't use Docusaurus, I think you may have intended to update the React Native docs.