fix sentence

Author: tshepang

src/panic-implementation.md

@@ -108,6 +108,6 @@ 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, std's [runtime
-service](https://github.com/rust-lang/rust/blob/master/library/std/src/rt.rs)
-wrap the call to the user-provided `main` function is wrapped in `catch_unwind`.
+`catch_unwind`. In particular, in std's [runtime
+service](https://github.com/rust-lang/rust/blob/master/library/std/src/rt.rs),
+the call to the user-provided `main` function is wrapped in `catch_unwind`.