Update release notes/authors for 0.11.0

Detailed notes have their skeleton [on the wiki](https://github.com/rust-lang/rust/wiki/Doc-detailed-release-notes) (and need filling out).
Worth mentioning some specifics? "Modules declared via `mod foo;` must now be `foo/mod.rs` (not `foo.rs`) if they have submodules loaded from other files" (that's the rule right?)