Remove link to stabilization guide

Author: mark-i-m

index.md

@@ -23,7 +23,6 @@ PRs against [rust-lang-nursery/rust-forge].
 * [Rustc bug fix procedure](rustc-bug-fix-procedure.html): Describes the process for bug fixes that may cause existing code to stop
   compiling.
 * [So you want to implement a feature?](feature-guide.html): Describes the procedure for implementing new features in rustc.
-* [So you want to stabilize a feature?](stabilization-guide.html): Describes the procedure for stabilizing features in rustc.
 
 ### Interested in infrastructure and the release process?