Fix URLs in docs

Author: alexcrichton

compiler/rustc_target/src/spec/targets/wasm32_wasi.rs

@@ -1,8 +1,8 @@
 //! NB: This target is in the process of being renamed to
 //! `wasm32-wasi-preview1`. For more information see:
 //!
-//! * https://github.com/rust-lang/compiler-team/issues/607
-//! * https://github.com/rust-lang/compiler-team/issues/695
+//! * <https://github.com/rust-lang/compiler-team/issues/607>
+//! * <https://github.com/rust-lang/compiler-team/issues/695>
 
 use crate::spec::Target;