Update newbs_getting_started to include instructions for apple silicon (#19579)

Co-authored-by: Joel Challis <git@zvecr.com>

docs/newbs_getting_started.md

@@ -56,11 +56,17 @@ QMK maintains a Homebrew tap and formula which will automatically install the CL
 
 You will need to install Homebrew. Follow the instructions on https://brew.sh.
 
+!> **NOTE:** If you are using Apple Silicon, such as the M1, you will need to install a rosetta compatible version of Homebrew. This version does not override the base Homebrew. This can be done by running `arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"`. See here: [Rosetta-compatible Homebrew](https://stackoverflow.com/questions/64882584/how-to-run-the-homebrew-installer-under-rosetta-2-on-m1-macbook)
+
 #### Installation
 
 Install the QMK CLI by running:
 
     brew install qmk/qmk/qmk
+    
+Install the QMK CLI on an Apple Silicon Mac by running:
+
+    arch -x86_64 brew install qmk/qmk/qmk
 
 ### ** Linux/WSL **