Update react/README.md

[rahulrk-dev]

Fix jsx display issue in webpage
https://airbnb.io/javascript/react/#quotes

Fixes #2301

[ljharb]

I see the issue you’re referencing. Can you link to something that describes how this fixes it? This doesn’t fix it for all the other cases of self-closing elements in the page; is there a more holistic solution?

[rahulrk-dev]

@ljharb Here's the output for the fix -
https://devtmk.github.io/javascript/react/#quotes

[ljharb]

@devtmk i'm confused; https://devtmk.github.io/javascript/react/#quotes has different JSX than https://airbnb.io/javascript/react/#quotes.

There's also highlighting issues here:

• https://airbnb.io/javascript/react/#spacing
• https://airbnb.io/javascript/react/#tags

and probably a number of other places. It'd be great to figure out a way to fix them all at once, without requiring inline annotations.

[DetrojaRadhey]

@ljharb, I have used HTML character entities to display JSX code in a markdown format without being rendered as HTML.

Review this PR and let me know if any changes needed:
#3060

[ljharb]

@DetrojaRadhey i commented on the PR with how that doesn't fix it; but also, please don't post a duplicate PR. In the future, post a link to your changes and a maintainer can pull them in.