Cleanup dox mess

src/cloudabi/mod.rs

src/dox.rs

src/fuchsia/mod.rs

src/lib.rs

src/macros.rs

src/redox/mod.rs

src/unix/bsd/apple/mod.rs

src/unix/bsd/freebsdlike/dragonfly/mod.rs

src/unix/bsd/freebsdlike/freebsd/aarch64.rs

src/unix/bsd/freebsdlike/freebsd/arm.rs

src/unix/bsd/freebsdlike/freebsd/mod.rs

src/unix/bsd/freebsdlike/freebsd/powerpc64.rs

src/unix/bsd/freebsdlike/freebsd/x86.rs

src/unix/bsd/freebsdlike/freebsd/x86_64.rs

src/unix/bsd/freebsdlike/mod.rs

src/unix/bsd/mod.rs

src/unix/bsd/netbsdlike/mod.rs

src/unix/bsd/netbsdlike/netbsd/aarch64.rs

src/unix/bsd/netbsdlike/netbsd/arm.rs

src/unix/bsd/netbsdlike/netbsd/mod.rs