Update fw/compile-firmware.md

Co-authored-by: burkfers <[email protected]>

fw/compile-firmware.md

@@ -35,7 +35,7 @@ Clone the BKB QMK repository, using either github desktop or the command line, a
 ```shell
 git clone https://github.com/bastardkb/bastardkb-qmk
 cd bastardkb-qmk
-git checkout origin/bkb-master
+git checkout -b bkb-master origin/bkb-master
 ```
 
 Now that you've cloned the repository, `cd` into it and set it as the default local QMK repository. You also need to do this if you had a previous, separate QMK installation.