remove unnecessary return stmt from docs
rename br instructions to be if instructions

follows the jvm bytecode pattern. easier to think about if the label
is where to go if the condition check does not pass
this is just compilation so far. still need to fix info and interpreter
rename branch instructions to be if in qbi

now displays instructions to match how they're compiled.
still need to fix the code execution.
change qbrt to execute if instructions

instead of the old school br instructions