Auto merge of #1290 - gnzlbg:doc_link, r=gnzlbg
Auto merge of #1290 - gnzlbg:doc_link, r=gnzlbg

Link docs for other platforms in docs.rs

rust-lang-nursery/libc,rust-lang-nursery/libc,rust-lang/libc,rust-lang/libc,rust-lang/libc,rust-lang-nursery/libc