Rename DOCS.md as GUIDELINES.md (#50525)

Summary:
Pull Request resolved: #50525

Changelog: [internal]

Just a rename of the file and moving relevant documentation to the README.

Reviewed By: GijsWeterings

Differential Revision: D72562795

fbshipit-source-id: d675037376a0345dd7d178cf5863f4093eb74542

Author: rubennorte

__docs__/DOCS.md __docs__/GUIDELINES.md

@@ -1,8 +1,6 @@
-# React Native Technical Documentation
+# React Native Technical Documentation Guidelines
 
-The React Native technical documentation describes how React Native works internally, the subsystems it is composed of, how they work and how they interact with each other.
-
-The intended audience is people who want to learn about the internals of React Native and contribute to it. **End users of React Native are meant to use the [public website](https://reactnative.dev) instead** (its code can be found [here](https://github.com/facebook/react-native-website)).
+_This is a document about documentation (hence the file name)._
 
 ## Motivation
 

__docs__/README.md

@@ -1,8 +1,10 @@
-# React Native Documentation
+# React Native Technical Documentation
 
-This is the internal technical documentation for React Native. It is not intended for end users of the platform.
+The React Native technical documentation describes how React Native works internally, the subsystems it is composed of, how they work and how they interact with each other.
 
-For information on our documentation strategy and structure, see [DOCS.md](./DOCS.md).
+The intended audience is people who want to learn about the internals of React Native and contribute to it. **End users of React Native are meant to use the [public website](https://reactnative.dev) instead** (its code can be found [here](https://github.com/facebook/react-native-website)).
+
+For details on how we approach technical documentation in this repository, see [GUIDELINES.md](./GUIDELINES.md).
 
 ## Usage