Fix a typo in the readme

[MehtaRiddhi]

@jasmussen

I have Fixed some content changes in README.md and CONTRIBUTING.md file.

[jasmussen]

I appreciate your desire to contribute to Gutenberg, thank you!

However this is a fairly small change, and IMO not necessary.

[nylen]

The first comma is correctly placed.

The second one is a good typo fix:

editor focus in a core

Let's just take that second change, @MehtaRiddhi. Want to update this PR and get rid of the comma change?

[MehtaRiddhi]

@nylen,

Thanks for your suggestion. I have updated my PR and just take the second change.

Please review it and let me know if anything.

Thanks,

[nylen]

Thanks for the fix!

[paulwilde]

Umm, wasn't it already correct? This doesn't seem to make sense now.

[nylen]

"editor focus in core" is fine; the previous "editor focus in a core" makes me think of an apple or a nuclear reactor.

"editor focus in WordPress core" is perhaps better.

[paulwilde]

It was changed from "in [WordPress] core" to "in a core" though, not the other way.

So there wasn't an issue to begin with. :)

[nylen]

Ahhh! How did I misread that. Sorry guys :)