doc/manual: Fix @subpage handling

The subpage "thelist" used to have a title "Pending and Open Tasks"
but the commit c41db35 changed it to "The List". With
@subpage, it now renders:

    "The List of The List enumerates opportunities for"

instead of

    "The List of Pending and Open Tasks enumerates opportunities for"

This commit fix it to

    "The List enumerates opportunities for"

Change-Id: Ifee0dcd9b3c9f7e651a8748a7afda99eedea3c5c
Signed-off-by: Yasushi SHOJI <[email protected]>
Reviewed-on: http://openocd.zylin.com/6041
Tested-by: jenkins
Reviewed-by: Antonio Borneo <[email protected]>

Author: yashi

doc/manual/main.txt

@@ -9,7 +9,7 @@ and processes that have been developed by and for the OpenOCD community.
 Developers that want to contribute to OpenOCD should read the following
 sections before starting work:
 
-- The List of @subpage thelist enumerates opportunities for improving or
+- @subpage thelist enumerates opportunities for improving or
 extending the OpenOCD platform.  If your ideas are on The List, you might
 check the mailing list archives to find the status of your feature (or bug).
 - The @subpage styleguide provides rules that developers should