Merge bitcoindevkit/bdk#1290: doc(example_cli): add missing cli docs

c4d5f2ccd8435b9c424eec5ba35ba44a3383b04d doc(example_cli): add missing cli docs (vmammal)

Pull request description:

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  evanlinjin:
    ACK c4d5f2ccd8435b9c424eec5ba35ba44a3383b04d

Tree-SHA512: 43684abbb32570f07e0dc05ed07062bc7969cbe7c4fefe8ae7ebe41ac28aedfbba76ffc801bc4ddb3bf08a940ca81c128376dc3f6c76a04f1391e43c18e0d50b

example-crates/example_cli/src/lib.rs

@@ -73,7 +73,9 @@ pub enum Commands<CS: clap::Subcommand, S: clap::Args> {
     },
     /// Send coins to an address.
     Send {
+        /// Amount to send in satoshis
         value: u64,
+        /// Destination address
         address: Address<address::NetworkUnchecked>,
         #[clap(short, default_value = "bnb")]
         coin_select: CoinSelectionAlgo,
@@ -144,14 +146,17 @@ pub enum AddressCmd {
     New,
     /// List all addresses
     List {
+        /// List change addresses
         #[clap(long)]
         change: bool,
     },
+    /// Get last revealed address index for each keychain.
     Index,
 }
 
 #[derive(Subcommand, Debug, Clone)]
 pub enum TxOutCmd {
+    /// List transaction outputs.
     List {
         /// Return only spent outputs.
         #[clap(short, long)]