Fix Numbrero Handwired make example in readme (#6379)

Fix Numbrero Handwired make example in readme

keyboards/handwired/numbrero/readme.md

@@ -8,6 +8,6 @@ Hardware Availability: The Board Podcast Slack
 
 Make example for this keyboard (after setting up your build environment):
 
-    make handwired/numbrero/numbrero:default
+    make handwired/numbrero: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).