add note on using ld

I'm assuming that the linker ld is just getting confused here but I tried both capitalized flags and lowercase flags.

This is what it reports on my system.

ld -d says "no input files" ld -g says "no input files" ld -i says "no input files" ld -m says "missing argument to m" ld -n says "no input files" ld -q says "no input files" ld -r says "no input files" ld -s says "no input files" ld -t says "no input files" ld -v reports the version ld -x says "no input files"

ld -E says "no input files" ld -G says "no input files" ld -E says "no input files" ld -M says "no input files" ld -N says "no input files" ld -Q says "no input files" ld -S says "no input files" ld -U says "no input files" ld -V is the same as -v but reports the emulations ld -X says "no input files"