fix codeblocks in the document

[koka831]

While I've looked into #9990, I found broken code blocks in the document.

This patch not only improves visibility, but also fixes a potential bug. When a lint description ends with code block, the string will have three backquotes at the end.
Since the current implementation prints the default value immediately after that, the markdown renderer is unable to properly close the code block.

e.g. arithmetic_side_effects, we can see code block is not rendered properly, and (I think) it's bit hard to understand what "defaults to `[]`" is meant.

In this PR, it will be rendered as:

changelog: none

r? @xFrednet

[xFrednet]

Hey, thank you for change. That example lint description looks interesting? I'm happy that this PR will fix it.

@bors r+

[bors]

📌 Commit fae19a9 has been approved by xFrednet

It is now in the queue for this repository.

[bors]

⌛ Testing commit fae19a9 with merge 266eef7...

[xFrednet]

@koka831

I think it's bit hard to understand what "defaults to []" is meant.

Maybe, do you have a suggestion, how this can be expressed better? 🙃

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: xFrednet
Pushing 266eef7 to master...

[koka831]

@xFrednet thank you for the review!

I think it's bit hard to understand what "defaults to []" is meant.

sorry, to be clear, I meant by its position.
Since the previous format is like: [key]: some long description (default to [type]) so config key and its default value are bit far apart.

[xFrednet]

Ah okay, thank you for the clarification!

And you're welcome for the review! :)