Function: timeclock-out

Clock out, recording the current time moment in the timelog.
If a prefix ARG is given, the user has completed the project that was
begun during the last time segment.

REASON is the user's reason for clocking out. If REASON is nil, and
FIND-REASON is non-nil -- or the user calls `timeclock-out'
interactively -- call the function `timeclock-get-reason-function' to
discover the reason.

(fn &optional ARG REASON FIND-REASON)