Update keyboards/b_sides/rev41lp/readme.md

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

keyboards/b_sides/rev41lp/readme.md

@@ -10,6 +10,6 @@ Inspired by the REVIUNG series by Gtips, the rev41lp is 41-key column staggered
 
 Make example for this keyboard (after setting up your build environment):
 
-    make revlp41:default
+    make b_sides/rev41lp: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).