This adds a link to the "raw" version of the JSON schema for descriptors.

Fixes #

Proposed Changes

1. this adds a link labeled(raw) after the reference to the JSON schema for linter descriptors. While working on validating a plugin, I attempted to use v8r with the URL mentioned on the plugins.md page only to be met with the error Unexpected token '<', " which confused me as there was no < in my plugin descriptor. I eventually realized that the link on the plugins page points to the JSON schema file in the repo, not raw version that I could pass to v8r -s https://.... . Rather than change the existing link, I added a new link with the (raw) title after it. I'm pretty sure there are more attractive ways to accomplish the same thing, so I'm very open to feedback, modifications, etc..

Readiness Checklist

Author/Contributor

• Add entry to the CHANGELOG: I didn't because it's just a small addition to a page on the site, not MegaLinter itself
• If documentation is needed: same, just a small update to the site

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance