--no-show-raw-insn with one '-' at start in examples

[alexgoto]

Some pages have this misprint in parameters of objdump call.

Pages:

https://docs.rust-embedded.org/embedonomicon/main.html https://docs.rust-embedded.org/embedonomicon/exceptions.html https://docs.rust-embedded.org/embedonomicon/asm.html

[adamgreig]

Ah, this isn't a misprint so much as all the binutils used to require a single dash (when the book was written) but have since been updated to support/require two dashes instead. If you're up for opening a PR with the changes I'd happily merge it.

[alexgoto]

@adamgreig #84

[eldruin]

This was fixed in #84.