Summary:
On support page [https://github.com/facebook/react-native/blob/master/.github/SUPPORT.md](url) there's an url to reactiflux with missing '.com' suffix :-)

## Changelog

<!-- Help reviewers and the release process by writing your own changelog entry. For an example, see:
https://github.com/facebook/react-native/wiki/Changelog
-->

[GENERAL] [Fixed] - Updated reactiflux url

Pull Request resolved: https://github.com/facebook/react-native/pull/30709

Test Plan: No test needed

Reviewed By: kacieb

Differential Revision: D25916668

Pulled By: TheSavior

fbshipit-source-id: a6193ec67bd8faf64a581036a891d1f9aeb1fd1d

Summary:
We recently updated React Native's docs site to have its own domain reactnative.dev and needed to update the URLs in the source code

CHANGELOG:
[INTERNAL]

Reviewed By: hramos

Differential Revision: D20072842

fbshipit-source-id: 1970d9214c872a6e7abf697d99f8f5360b3b308e

Summary:
Followup to fe80a0c0. Use a Markdown extension to let GitHub know this can be rendered as a Preview, otherwise GitHub will display the plaintext version.

[General] [Fixed] - Use Markdown in SUPPORT file
Pull Request resolved: https://github.com/facebook/react-native/pull/23791

Differential Revision: D14349422

Pulled By: hramos

fbshipit-source-id: 836746f35c6e962f3ca64a138bbf764529a6e043

Summary:
See https://help.github.com/en/articles/adding-support-resources-to-your-project. The SUPPORT file is surfaced by GitHub in several useful places. The goal is to increase discoverability of all support resources, giving the reader an opportunity to find the help they need before they open an issue in the              repository. A secondary goal is to use a friendlier tone when communicating our processes.

The issue templates have been standardized to follow the format used by GitHub's template tool. A bug in the "Regressions" template, due to its use of multiple labels, is fixed as well.
The bot will explain how a changelog can be fixed when it nags a PR.

[General][Added] - Added SUPPORT resources, friendlier messaging.
Pull Request resolved: https://github.com/facebook/react-native/pull/23778

Differential Revision: D14333911

Pulled By: hramos

fbshipit-source-id: d4b3e75194ea7d5c932dd8df2393d5b189f30f35