doc: Add logging option to Korean lxc-attach(1)

doc/ko/lxc-attach.sgml.in

@@ -63,6 +63,7 @@ by Sungbae Yoo <sungbae.yoo at samsung.com>
       <arg choice="opt">--keep-env</arg>
       <arg choice="opt">--clear-env</arg>
       <arg choice="opt">-- <replaceable>command</replaceable></arg>
+      <arg choice="opt">-L <replaceable>file</replaceable></arg>
     </cmdsynopsis>
   </refsynopsisdiv>
 
@@ -300,6 +301,28 @@ by Sungbae Yoo <sungbae.yoo at samsung.com>
 	</listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term>
+          <option>-L, --pty-log <replaceable>file</replaceable></option>
+        </term>
+        <listitem>
+          <para>
+            <!--
+            Specify a file where the output of <command>lxc-attach</command> will be
+            logged.
+              -->
+            <command>lxc-attach</command>의 출력을 기록할 파일을 지정한다.
+          </para>
+          <para>
+            <!--
+            <emphasis>Important:</emphasis>  When a standard file descriptor
+            does not refer to a pty ouput produced on it will not be logged.
+            -->
+            <emphasis>중요:</emphasis> 표준 입출력 파일 디스크립터가 pty를 참조하지 않으면, 기록되지 않는다.
+          </para>
+        </listitem>
+      </varlistentry>
+
     </variablelist>
 
   </refsect1>