updating broken iris documentation links to match updated website (#3356)

keyboards/iris/readme.md

@@ -15,6 +15,6 @@ Example of flashing this keyboard:
 
     make iris/rev2:default:avrdude
 
-See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
+See [build environment setup](https://docs.qmk.fm/#/newbs_getting_started) then the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information.
 
 A build guide for this keyboard can be found here: [Iris Build Guide](https://docs.keeb.io/iris-build-guide.html)