[daip] Typo in the AIPS cookbook

[Buckner M Creel V]

Greetings.  In C.4, page C-3, of the AIPS cookbook, line 1 
for each of steps 4, 5 and 6, it should be "this step is 
not necessary".  Note the "in" change to "is".

Cheers,
Buckner