fix(lint/md): bare url

Author: vinceAmstoutz

core/upgrade-guide.md

@@ -141,6 +141,5 @@ As this is an `extraProperties` it's configurable per resource/operation. This i
 
 ### OpenApi context
 
-You may want to convert your openApiContext to openapi, doing so is quite fastidious, @lyrixx created a rector script to help if needed:
-
-https://github.com/lyrixx/rector-apip-openapi
+You may want to convert your openApiContext to openapi, doing so is quite fastidious, @lyrixx created a rector script to
+help if needed: [lyrixx/rector-apip-openapi](https://github.com/lyrixx/rector-apip-openapi).