perf daemon: Complete list of supported subcommand in help message

perf daemon supports start, signal, stop and ping subcommands, complete it

Before:

# perf daemon -h
Usage: perf daemon start [<options>]
or: perf daemon [<options>]

-v, --verbose be more verbose
-x, --field-separator[=<field separator>]
print counts with custom separator
--base <directory>
base directory
--config <config file>
config file path

After:

# perf daemon -h

Usage: perf daemon {start|signal|stop|ping} [<options>]
or: perf daemon [<options>]

-v, --verbose be more verbose
-x, --field-separator[=<field separator>]
print counts with custom separator
--base <directory>
base directory
--config <config file>
config file path

Signed-off-by: Yang Jihong <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/builtin-daemon.c

···
 };
 
 static const char * const daemon_usage[] = {
-	"perf daemon start [<options>]",
+	"perf daemon {start|signal|stop|ping} [<options>]",
 	"perf daemon [<options>]",
 	NULL
 };