doc/manual{src -> source}
This is needed to avoid this https://github.com/mesonbuild/meson/issues/13774 when we go back to making our subproject directory `src`.
Co-Authored-By: Qyriad <qyriad@qyriad.me> Co-Authored-By: Robert Hensing <robert@roberthensing.nl> Co-Authored-By: eldritch horrors <pennae@lix.systems> Co-authored-by: Jörg Thalheim <Mic92@users.noreply.github.com> Co-authored-by: Tom Bereknyei <tomberek@gmail.com>