Fix parameter name in help for `jit_dump_insn'

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
gitignore: ignore output of `git format-patch'

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
Fix mistake in example for `jit_value_create_nint_constant'

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
Document return value of jit_insn_new_block and...

jit_insn_store_relative which return non-zero values on success.

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
Fix documentation of jit_value_create_constant

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
Verify return value of jit_value_get_function

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>