doc/port-search.1: Document --maintainers option
doc/port-search.1: Document --maintainers option

https://lists.macports.org/pipermail/macports-dev/2017-March/035571.html

neverpanic/macports-base,danchr/macports-base,macports/macports-base,macports/macports-base,danchr/macports-base,neverpanic/macports-base