separate link target from normal content

Author: tshepang

src/panic-implementation.md

@@ -107,7 +107,9 @@ responsible for unwinding the stack, running any 'landing pads' associated
 with each frame (currently, running destructors), and transferring control
 to the `catch_unwind` frame.
 
-Note that all panics either abort the process or get caught by some call to
-`catch_unwind`. In particular, in std's [runtime
-service](https://github.com/rust-lang/rust/blob/master/library/std/src/rt.rs),
+Note that all panics either abort the process or get caught by some call to `catch_unwind`.
+In particular, in std's [runtime service],
 the call to the user-provided `main` function is wrapped in `catch_unwind`.
+
+
+[runtime service]: https://github.com/rust-lang/rust/blob/master/library/std/src/rt.rs