Fix broken links

src/appendix/humorust.md

@@ -10,4 +10,4 @@ enlightening?
 - [Rust Koans](https://users.rust-lang.org/t/rust-koans/2408)
 - [`break rust;`](https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=0ab2bd6a9d722e0f05a95e2a5dcf89cc)
 - [The Nomicon Intro](https://doc.rust-lang.org/stable/nomicon/)
-- [`rustc-ty` renaming punfest](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/rustc-ty.20naming.20bikeshed.20.2F.20punfest.20\(was.3A.20design.20meeting.202.2E.2E.2E/near/189906455)
+- [`rustc-ty` renaming punfest](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/rustc-ty.20naming.20bikeshed.20.2F.20punfest.20%28was.3A.20design.20meeting.202.2E.2E.2E/near/189906455)

src/closure.md

@@ -118,7 +118,7 @@ the *free variables* meaning they are not bound to the context of the closure.
 [`compiler/rustc_middle/src/ty/query/mod.rs`][upvars] defines a query called *upv.rs_mentioned*
 for this purpose.
 
-[upvars]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/query/queries/struct.upvars_mentioned.html
+[upvars]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_query_impl/queries/struct.upvars_mentioned.html
 
 Other than lazy invocation, one other thing that distinguishes a closure from a
 normal function is that it can use the upvars. It borrows these upvars from its surrounding

src/contributing.md

@@ -565,7 +565,7 @@ are:
 [rif]: http://internals.rust-lang.org
 [rr]: https://doc.rust-lang.org/book/README.html
 [rustforge]: https://forge.rust-lang.org/
-[tlgba]: http://tomlee.co/2014/04/a-more-detailed-tour-of-the-rust-compiler/
+[tlgba]: https://tomlee.co/2014/04/a-more-detailed-tour-of-the-rust-compiler/
 [ro]: https://www.rustaceans.org/
 [rctd]: https://rustc-dev-guide.rust-lang.org/tests/intro.html
 [cheatsheet]: https://bors.rust-lang.org/