[Keyboard] Fix readme make examples for some Kingly Keys boards (#7308)

keyboards/kingly_keys/romac/readme.md

@@ -11,6 +11,6 @@ A “Plaid” Inspired 12-Key (3x4) Macropad.
 
 Make example for this keyboard (after setting up your build environment):
 
-    make romac:default
+    make kingly_keys/romac: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).

keyboards/kingly_keys/romac_plus/readme.md

@@ -11,6 +11,6 @@ An Upgraded “Plaid” Inspired 12-Key (3x4) Macropad With Fancy Features.
 
 Make example for this keyboard (after setting up your build environment):
 
-    make romac_plus:default
+    make kingly_keys/romac_plus: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).

keyboards/kingly_keys/ropro/readme.md

@@ -11,6 +11,6 @@ Hardware Availability: [Kingly-Keys.xyz](https://kingly-keys.xyz/) - (Through GB
 
 Make example for this keyboard (after setting up your build environment):
 
-    make ropro:default
+    make kingly_keys/ropro: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)