MINOR; Replace gt and lt char with html encoding

[jsancio]

Use > and < instead of > and < to properly render the characters in HTML.

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)

[chia7712]

@jsancio thanks for this patch. Should we fix following similar error?

https://github.com/apache/kafka/blob/trunk/docs/ops.html#L3842
https://github.com/apache/kafka/blob/trunk/docs/ops.html#L3845
https://github.com/apache/kafka/blob/trunk/docs/ops.html#L4249

[jsancio]

Thanks @chia7712 . I fixed those encoding issues.

https://github.com/apache/kafka/blob/trunk/docs/ops.html#L4249

I couldn't find anything wrong with that line. Did you mean to link to another line? Or did I miss something?

[chia7712]

I couldn't find anything wrong with that line. Did you mean to link to another line? Or did I miss something?

</code>true</code> -> <code>true</code>

[jsancio]

I couldn't find anything wrong with that line. Did you mean to link to another line? Or did I miss something?

</code>true</code> -> <code>true</code>

Thanks @chia7712 . Done.