removed a reference to an Issue with installation

removed a reference to an Issue with installation on Mac OS, which is now Closed - https://github.com/michaelmcandrew/civicrm-buildkit-docker/issues/15

docs/tools/buildkit.md

@@ -40,8 +40,8 @@ If you have [Docker](https://www.docker.com/) running, you can use one of the fo
 
 !!! Note
 
-    There different version of Buildkit on Docker. Michael McAndrew's seems to be the easiest to get started with on Linux. There is an [outstanding issue](https://github.com/michaelmcandrew/civicrm-buildkit-docker/issues/15) that needs to be resolved before getting set up on a Mac is as straight forward.
-
+    There are different versions of Buildkit on Docker. Michael McAndrew's seems to be the easiest to get started with on Linux. 
+    
 #### Install buildkit on docker on ubuntu
 
 Follow the official installation instructions from https://docs.docker.com/compose/install/ to install docker compose on your linux machine.