fix typi

jk.c

@@ -2497,7 +2497,7 @@ cS AHELP =\
 "xf\".     eachpriorwith 0-\".1 2 2 3 5 6 yields 1 1 0 1 2 1" "\n"\
 "f/       fold          +/1 2 3 yields 6" "\n"\
 "xf/      foldwith      1+/1 2 3 yields 7" "\n"\
-"f\\       scan          +/1 2 3 yields 1 3 6" "\n"\
+"f\\       scan          +\\1 2 3 yields 1 3 6" "\n"\
 "xf\\      scanwith      1+\\1 2 3 yields 1 2 4 7" "\n"\
 "f/.      converge      1;_/.1 2 3 yields ()" "\n"\
 "f\\.      converges     1;_\\.1 2 3 yields 1 2 3,:2 3,:(,3),:()" "\n"\