Update spark.md

Author: grimpirate

docs/spark.md

@@ -18,8 +18,9 @@ php spark halberd:totp <id>
 
 ## halberd:tidy
 
-Cleans up the grimpirate/halberd vendor repository to remove all but the needed source files.
+Cleans up the grimpirate/halberd vendor repository.  This will reduce the vendor folder size by removing unneeded files from the package install.
 
 ``` bash title=">_"
 php spark halberd:tidy
-```
+
+```