doc/ko: Add missing options in uftrace-record.md

[KyeongTaek]

The missing option '--trace=STATE' is translated and added to uftrace-record.md in Korean.

[MichelleJin12]

Thank you for contributing @KyeongTaek

Could you add other missing options in uftrace-record.md?
like

uftrace/doc/uftrace-record.md

Lines 226 to 229 in 9d88589

	-g, \--agent
	: Spawn an agent thread in the target. At runtime, the agent receives
	external commands and can change supported tracing options. See *AGENT*
	section in the `uftrace-live`(1).

[ntw8651]

I think that It is a good contribution @KyeongTaek
Could you add other things in uftrace-record.md?

uftrace/doc/uftrace-record.md

Lines 243 to 245 in 9d88589

	These filters can be applied either at record time or replay time. They can be
	added and removed at runtime from the client. See `uftrace-live`(1) for details
	about agent operations.

"They can -..."
and this

uftrace/doc/uftrace-record.md

Line 892 in 9d88589

* "var": read value of a global variable given after ":".

uftrace/doc/uftrace-record.md

Lines 909 to 922 in 9d88589

	This is how to use 'var' watchpoints:
	$ uftrace -W var:mydata a.out
	# DURATION TID FUNCTION
	[239842] | __monstartup() {
	[239842] | /* watch:var (mydata=7) */
	3.534 us [239842] | } /* __monstartup */
	0.191 us [239842] | __cxa_atexit();
	[239842] | main() {
	[239842] | foo() {
	[239842] | /* watch:var (mydata=42) */
	0.381 us [239842] | bar();
	1.069 us [239842] | } /* foo */
	2.698 us [239842] | } /* main */

thank you.

[namhyung]

LGTM