Fix quick7 build command (#8812)

keyboards/yushakobo/quick7/readme.md

@@ -10,6 +10,6 @@ A simple macropad for the beginners.
 
 Make example for this keyboard (after setting up your build environment):
 
-    make quick7:default
+    make yushakobo/quick7: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).