Cross-compilation should document Python host version

[lissyx]

When cross-compiling python binding, we rely on a multistrap generated chroot to build but we still need python on the host as well. Documentation should emphasize that in chroot and host version needs to match (up to major version), e.g., you need 3.7.x for building for a chroot 3.7.y, you can't have chroot using 3.7.y and host being 3.8.z.

[Abhiram Ravikumar]

Hi @lissyx I'd like to pick this up. Can you let me know how to get started?

[Janeenm]

#3665

[ansu-gold]

Is this fixed or still needs fixing?

[SL]

Can I take this up? Please guide me further.