fix: address styling issues with empty lines in code blocks #5140
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What type of PR is this?
/kind bug
What this PR does / why we need it:
修改 code 内
br
标签的display
,用于适配 firefox 浏览器How to test it?
测试在 firefox 浏览器下,使用代码块回车等是否会出现样式问题。
Which issue(s) this PR fixes:
Fixes #5064
Does this PR introduce a user-facing change?