Fix a violation of the HTML 5 standard (paragraph 4.5.6 "The cite element").
It is intended for titles, not to wrap complete citation blocks.

Found in a conversation with job@ and tb@.

Formatting of the .%T (title) macro needs some logic to adhere to
traditional typographic conventions that are already implemented for
terminal output: set titles of independent works (like books or

Formatting of the .%T (title) macro needs some logic to adhere to
traditional typographic conventions that are already implemented for
terminal output: set titles of independent works (like books or RFCs)
in italic and of parts of larger works (like journal articles)
in quotation marks and roman font. Do that in HTML output, too.

OK job@ (without the regress parts),
and tb@ appears to agree with the general direction

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test new .%R RFC hyperlink formatting (mdoc_html.c rev. 1.226)