tools lib traceevent: Change description of few APIs

tools lib traceevent: Change description of few APIs

APIs descriptions should describe the purpose of the function, its
parameters and return value. While working  on man pages implementation,
I noticed mismatches in the  descriptions of few APIs.  This patch
changes the description of these APIs, making them consistent with the
man pages:

 - tep_print_num_field()
 - tep_print_func_field()
 - tep_get_header_page_size()
 - tep_get_long_size()
 - tep_set_long_size()
 - tep_get_page_size()
 - tep_set_page_size()

Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/linux-trace-devel/20190325145017.30246-2-tstoyanov@vmware.com
Link: http://lkml.kernel.org/r/20190401164343.396759247@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>