docs: use SYNOPSIS format consistent with other man pages
docs: use SYNOPSIS format consistent with other man pages

Tweak collectl2pcp format after discussion with Marko - this
is the more common form used throughout PCP.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp