added a little bit of documentation for the commands

src/app/args/structure.rs

@@ -8,7 +8,10 @@ pub struct Args {
 
 #[derive(Subcommand)]
 pub enum CommandArg {
+    /// Builds the documentation into a dist folder
     Build,
+    /// Checks if everything required for docki is installed
     Health,
+    /// Helper command for installing asciidoctor-reveal-js
     InstallReveal
 }