Remove iOS doc links from README
Remove iOS doc links from README

mneumann/libc,zethra/libc,mneumann/libc,cactorium/libc,rust-lang/libc,zethra/libc,rust-lang-nursery/libc,rust-lang/libc,philippkeller/libc,cactorium/libc,rust-lang-nursery/libc,cactorium/libc,mneumann/libc,zethra/libc,superriva/libc,rust-lang-nursery/libc,philippkeller/libc,philippkeller/libc,superriva/libc,superriva/libc,anatol/libc,anatol/libc,anatol/libc,rust-lang/libc