fix link

Author: tshepang

src/implementing_new_features.md

@@ -6,8 +6,8 @@ When you want to implement a new significant feature in the compiler,
 you need to go through this process to make sure everything goes
 smoothly.
 
-**NOTE: this section is for *language* features, not *library* features, which use [a different
-*process].**
+**NOTE: this section is for *language* features, not *library* features,
+which use [a different process].**
 
 [a different process]: ./stability.md