Add PR URL to frontmatter

Author: nickschot

text/0000-route-manager-api.md

@@ -6,7 +6,7 @@ release-versions:
 teams: # delete teams that aren't relevant
   - framework
 prs:
-  accepted: # Fill this in with the URL for the Proposal RFC PR
+  accepted: https://github.com/emberjs/rfcs/pull/1169
 project-link:
 suite: 
 ---