Update keyboards/gl516/a52gl/readme.md

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/gl516/a52gl/readme.md

@@ -11,7 +11,7 @@ Use the GL516 case.
 
 Make example for this keyboard (after setting up your build environment):
 
-    qmk flash -kb gl516/a52gl -km default
+    make gl516/a52gl:default
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).