Fix even more URLs

compiler/rustc_mir/src/transform/dest_prop.rs

@@ -8,7 +8,7 @@
 //! inside a single block to shuffle a value around unnecessarily.
 //!
 //! LLVM by itself is not good enough at eliminating these redundant copies (eg. see
-//! https://github.com/rust-lang/rust/issues/32966), so this leaves some performance on the table
+//! <https://github.com/rust-lang/rust/issues/32966>), so this leaves some performance on the table
 //! that we can regain by implementing an optimization for removing these assign statements in rustc
 //! itself. When this optimization runs fast enough, it can also speed up the constant evaluation
 //! and code generation phases of rustc due to the reduced number of statements and locals.