docs/cross_compiling: fix makedeps host/build desc

• makedepends_build is for the native chroot
• makedepends_host is for the foreign chroot

I had it the other way around in the documentation. The variables are so far not documented here yet:

• https://gitlab.alpinelinux.org/alpine/abuild/-/blob/master/APKBUILD.5.scd
• https://wiki.alpinelinux.org/wiki/APKBUILD_Reference

But it now matches the comments Caleb had written for the cross-native2 implementation, and also what can be found in e.g. the abuild APKBUILD in aports.git:

makedepends_build="pkgconfig scdoc"
makedepends_host="openssl-dev>3 zlib-dev"

approved this merge request

mentioned in commit ollieparanoid/pmbootstrap@58119697

added 9 commits

• be1044d4...7f886967 - 8 commits from branch postmarketOS:master
• 58119697 - docs/cross_compiling: fix makedeps host/build desc

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enabled an automatic merge when all merge checks for 58119697 pass

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merged