trace-cmd library: Add man pages for iterator functions

Add man pages for the following iterator functions:

    tracecmd_iterate_events()
    tracecmd_iterate_events_multi()
    tracecmd_follow_event()
    tracecmd_filter_add()

Link: https://lore.kernel.org/linux-trace-devel/20220922013737.3302850-3-rostedt@goodmis.org

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2 files changed