feat: cli usage

src/main.rs

@@ -20,13 +20,13 @@ struct Cli {
     /// Description in pinentry
     #[arg(long, short = 'd')]
     pub description: Option<String>,
-    // Prompt in pinentry
+    /// Prompt in pinentry
     #[arg(long)]
     pub prompt: Option<String>,
-    // Encryption key, must be 32 bytes and in HEX
+    /// Encryption key, must be 32 bytes and in HEX format
     #[arg(long, short = 'k')]
     pub encryption_key: String,
-    // Disable fallback to rpassword
+    /// Disable fallback to rpassword, default false
     #[arg(long, short = 'C')]
     pub disable_fallback_cli: Option<bool>,
 }