Documentation update to dump binary into disassembler

This request is for additional examples on the use of drdisas. What I'd like to see is an easy way to take any linux binary and feed it into drdisas.

I tried something like this:

`hexdump -x -v ./binary | ./drdisas`

It's not clear to me if this is correct as I see many lines where the instruction is marked as "xx". I do see a few instructions though. Anyway, some clear direction/documentation on how to do this with confidence would be nice.

I'm doing this on an Arm machine with an Arm binary.