Typo in manual for -fd-lines-as-comments

[Matt Fago]

FYI, the option -fd-lines-as-comments is missing the final 's' 
in the header in section 4.2 of the gfortran 4.1.2 manual:

http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gfortran/Fortran-Dialect-Options.html#Fortran-Dialect-Options


Thanks,
Matt