Fix typo in plugins -> remarkPlugins deprecation message

[marc2332]

Signed-off-by: Marc Espín mespinsanz@gmail.com

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)
• If applicable, I’ve added docs and tests

Description of changes

Change the to of the plugins deprecation message. It should be remarkPlugins instead of plugins. It doesn't make sense to migrate from plugins to plugins.

This is the message that I got:

[marc2332]

Hi! It seems you removed the template which we require. Here are our templates (pick the one you want to use and click raw to see its source):

* [`pull-request-template.md`](https://github.com/remarkjs/.github/blob/main/.github/pull-request-template.md)

I won’t send you any further notifications about this, but I’ll keep on updating this comment, and hide it when done!

Thanks, — bb

Not sure what the bot is talking about, it's the same template

[wooorm]

You removed the part that says “don’t remove this” (<!--do not edit: pr-->) ;)

[wooorm]

Thanks!