Add Doxygen requirements traceability commands (@requirement, @satisfies, @verifies)

[gblawrence03]

The syntax highlighting does not currently recognise the requirements traceability Doxygen commands added in Release 1.16.0: @requirement, @satisfies, and @verifies.

I believe these can just be added to the list of recognised commands:

"match": "(?<=[\\s*!\\/])[\\\\@](?:arg|attention|author|authors|brief|bug|copyright|date|deprecated|details|exception|invariant|li|note|par|paragraph|param|post|pre|remark|remarks|result|return|returns|retval|requirement|sa|satisfies|see|short|since|test|throw|throws|todo|tparam|verifies|version|warning|xrefitem)\\b(?:\\{[^}]*\\})?"