doc: Fix --task name in uftrace graph man page

The man pages generated by .md files require to have an escape character at the beginning for two dash options. This patch fixes the problem with the output as follows. Before: –task Print task graph instead of normal function graph. ... After: --task Print task graph instead of normal function graph. ... Signed-off-by: Honggyu Kim <honggyu.kp@gmail.com>
namhyung · Jul 30, 2023 · 1365aad · 1365aad
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diff --git a/doc/ko/uftrace-graph.md b/doc/ko/uftrace-graph.md
@@ -30,7 +30,7 @@ GRAPH 옵션
     사용하여 모든 필드를 숨길 수 있으며 기본 설정은 'total' 이다.
     필드에 대한 상세한 내용은 *FIELDS* 를 참고할 수 있다.
 
---task
+\--task
 :   일반적인 함수 그래프 대신 태스크 그래프를 출력한다. 출력된 각 노드들은
     프로세스 혹은 (초록색으로 표기된)스레드를 보여준다.
 

diff --git a/doc/uftrace-graph.md b/doc/uftrace-graph.md
@@ -28,7 +28,7 @@ GRAPH OPTIONS
     Multiple fields can be set by using comma.  Special field of 'none' can be
     used (solely) to hide all fields.  Default is 'total'.  See *FIELDS*.
 
---task
+\--task
 :   Print task graph instead of normal function graph.  Each node in the
     output shows a process or thread(printed in green color).