When adding code comment the note suggesting markdown with octicon doesn't show the octicon

[yardenshoham]

Description

No response

Screenshots

Gitea Version

current main

Can you reproduce the bug on the Gitea demo site?

Yes

Operating System

No response

Browser Version

.

[silverwind]

Noticed a similar issue on devtest page http://localhost:3000/devtest/flex-list:

[silverwind]

It seems those octicons do not exist, or at least markup is markdown:

https://primer.github.io/octicons/

[silverwind]

The first case was regressed in 6400668.