doc: add linkable headings for options #3250
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This adds linkable headings for the option list in the generated man page.
Most options already work, but
--hiddenuses.as its short form (-.),which prevents some man-to-HTML renderers from generating a stable anchor.
This change prefers the long option as the tag when the short option is not
ASCII alphanumeric, while preserving the usual short/long ordering for normal flags.
This addresses the request in #3243 to make option headings linkable.