Feature summary (what you would like to be able to do and where):
Use a separate, low priority flag for duplicate section headings.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
There's no rule saying one can't have several sections named the same in an article, yet Linter flags these as duplicate IDs, which are themselves considered high priority. Duplicate section headings are typically harmless and completely intended. Consider an hypothetical article describing some random software:

Compatibility

Linux/Windows

blah

Other

blah

Requirements

Linux/Windows

foo

Other

bar

Right now this triggers several "high priority" errors, which does not make sense.

Benefits (why should this be implemented?):
Having a separate flag for this case ("duplicate-sections" ?) under the "low priority" category would give editors a cleaner list of problems which actually require attention, without the added noise.