Fix automatic_links warnings

compiler/rustc_target/src/spec/crt_objects.rs

@@ -3,7 +3,7 @@
 //!
 //! Table of CRT objects for popular toolchains.
 //! The `crtx` ones are generally distributed with libc and the `begin/end` ones with gcc.
-//! See https://dev.gentoo.org/~vapier/crt.txt for some more details.
+//! See <https://dev.gentoo.org/~vapier/crt.txt> for some more details.
 //!
 //! | Pre-link CRT objects | glibc                  | musl                   | bionic           | mingw             | wasi |
 //! |----------------------|------------------------|------------------------|------------------|-------------------|------|

compiler/rustc_target/src/spec/mod.rs

@@ -950,7 +950,7 @@ pub struct TargetOptions {
     /// The MergeFunctions pass is generally useful, but some targets may need
     /// to opt out. The default is "aliases".
     ///
-    /// Workaround for: https://github.com/rust-lang/rust/issues/57356
+    /// Workaround for: <https://github.com/rust-lang/rust/issues/57356>
     pub merge_functions: MergeFunctions,
 
     /// Use platform dependent mcount function

compiler/rustc_target/src/spec/wasm32_unknown_unknown.rs

@@ -8,7 +8,7 @@
 //! (e.g. trying to create a TCP stream or something like that).
 //!
 //! This target is more or less managed by the Rust and WebAssembly Working
-//! Group nowadays at https://github.com/rustwasm.
+//! Group nowadays at <https://github.com/rustwasm>.
 
 use super::wasm32_base;
 use super::{LinkerFlavor, LldFlavor, Target};

compiler/rustc_target/src/spec/wasm32_wasi.rs

@@ -7,7 +7,7 @@
 //! intended to empower WebAssembly binaries with native capabilities such as
 //! filesystem access, network access, etc.
 //!
-//! You can see more about the proposal at https://wasi.dev
+//! You can see more about the proposal at <https://wasi.dev>.
 //!
 //! The Rust target definition here is interesting in a few ways. We want to
 //! serve two use cases here with this target: