Fix typo found by lintian

doc/ja/lxc-attach.sgml.in

@@ -327,7 +327,7 @@ by KATOH Yasufumi <karma at jazz.email.ne.jp>
           <para>
             <!--
             <emphasis>Important:</emphasis>  When a standard file descriptor
-            does not refer to a pty ouput produced on it will not be logged.
+            does not refer to a pty output produced on it will not be logged.
             -->
             <emphasis>重要:</emphasis> 標準ファイルディスクリプタが pty を参照していない場合、それらに対する出力は記録されないでしょう。
           </para>

doc/ko/lxc-attach.sgml.in

@@ -316,7 +316,7 @@ by Sungbae Yoo <sungbae.yoo at samsung.com>
           <para>
             <!--
             <emphasis>Important:</emphasis>  When a standard file descriptor
-            does not refer to a pty ouput produced on it will not be logged.
+            does not refer to a pty output produced on it will not be logged.
             -->
             <emphasis>중요:</emphasis> 표준 입출력 파일 디스크립터가 pty를 참조하지 않으면, 기록되지 않는다.
           </para>

doc/lxc-attach.sgml.in

@@ -247,7 +247,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 	  </para>
 	  <para>
 	    <emphasis>Important:</emphasis>  When a standard file descriptor
-	    does not refer to a pty ouput produced on it will not be logged.
+	    does not refer to a pty output produced on it will not be logged.
 	  </para>
 	</listitem>
       </varlistentry>