Docs: Code blocks writing standards

[xiaodong2008]

Refers to the pages in docs, I think that the first letter of text(like button) in code blocks should be capitalised.

For example, there is a violation of writing standards in /guide/components/attrs, it should be write like this:

- <button class="large">click me</button>
+ <button class="large">Click Me</button>

[bencodezen]

I think you're totally right @xiaodong2008! Appreciate the call out.

Do you have any interest in contributing a PR to standardize this?

[xiaodong2008]

Sure! I will fix this soon 🥰