Tag vendor import of mandoc at 2025-07-27

    Groff Compat Edition -- Interesting changes:
    + italics in section/subsection headers are now also bold, like groff
    + display "LOCAL" in response to invalid section numbers, like groff
    + tbl(7) rendering has been tweaked to be more like groff
    + scaling has been improved to better render poorly generated manuals
    + display "UNTITLED" in response to invalid man(7) titles, like groff
    + improve mandocd error handling of broken pipes
    + manual footers now always show NAME(SECTION) on the right, like groff