Steps to reproduce the issue

• Create some sub-categories below one parent category.
• Create a site module 'Articles - Categories' with this parent category.
• See four bugs/improvements for tab 'Advanced' respective the frontend HTML code.

Expected result

1. The 'Heading Style' setting is used in the HTML code of the the frontend in the same way as in the 'Articles' module
2. The 'Heading Style' offers selection 'h1' ... 'h6' and 'None' as in the 'Articles' module
3. The items style selection is similar named in the 'Articles - Categories' and the 'Articles' module
4. Inline help is given

Actual result

1. The 'Heading Style' setting is irrelevant for frontend site HTML code, there is always 'li' used
2. The 'Heading Style' offers selection 'h1' ... 'h5'
3. Items style selection is named 'Heading Style' and thus differs from 'Header Level' in the 'Articles' module
4. No inline help is given (this hurts as we have 'Heading Style' and 'Header Tag' selections in the 'Advanced' tab

System information (as much as possible)

• Found during review of #46037
• Tested in 5.4-dev, but I suspect it has been around for a while

Additional comments

• Missing h6 found by @richard67 👍
• If the 'Heading Style' selection is not needed (the categories should always only be 'li' entries) then the selection should be removed.
• I find both the label 'Heading Style' and 'Header Tag' inappropriate. How about something like 'Item Style'?