GitLab

Correctly declare markdown assembly code block as 'nasm'

See merge request os/gi4_uebung08!1

All C streams are flushed when returning from main.

We are linking against a C library anyways.

See: https://www.nasm.us/xdoc/2.14.02/html/nasmdoc3.html#section-3.9

See: https://www.nasm.us/xdoc/2.14.02/html/nasmdoc3.html#section-3.4.2

See: https://github.com/rouge-ruby/rouge/pull/457/