fix: doc

Author: mablr

crates/cast/src/cmd/keychain.rs

@@ -252,7 +252,7 @@ pub enum KeychainSubcommand {
         #[arg(long)]
         expiry: Option<u64>,
 
-        /// Spending limit in TOKEN:AMOUNT[:PERIOD] format. Repeatable.
+        /// Spending limit in "TOKEN:AMOUNT[:PERIOD]" format. Repeatable.
         #[arg(long = "limit", value_parser = parse_limit)]
         limits: Vec<TokenLimit>,