Trivial help message fix

*** lib/rt/ui/mail/manipulate.pm.old Sun Nov 26 00:06:39 2000
— lib/rt/ui/mail/manipulate.pm Sun Nov 26 00:06:55 2000
*** 438,444 ****
will kill request .

      %RT MERGE <num1> [INTO] <num2>

! will merge request into request .

      %RT SET owner <num> <user>
      will set request <num>'s owner to <user>.

— 438,444 ----
will kill request .

      %RT MERGE <num1> [INTO] <num2>

! will merge request into request .

      %RT SET owner <num> <user>
      will set request <num>'s owner to <user>.