Use correct comment style

Author: embeddedt

gradle.properties

@@ -16,7 +16,7 @@ refined_storage_version=3807951
 kubejs_version=1605.3.19-build.299
 ctm_version=MC1.16.1-1.1.2.6
 supported_minecraft_versions=1.16.4,1.16.5
-// Look up maven coordinates when changing shadow_version
+# Look up maven coordinates when changing shadow_version
 shadow_version=7.1.2
 
 fabric_loader_version=0.14.21