"plain text" code block convertion problem

[alerezaaa]

Hi

plain text code parts converted to

```plain text

instead of

```text

not supported in jekyll

it is text

it is plain text

For instence, I created this blog post: https://adehghanzadeh.github.io/Jekyll_minimal-mistake/try-to-deploy-this-blog-to-cloudflare-pages/

[souvikinator]

With markdown, both plain text and text works. So it's jekyll's issue. However it doesn't seem to cause an issue in the vanilla markdown, so I can switch from plain text to text. Should be live in the next release

[souvikinator]

The changes are live in v2.5.4.