chore(tx-builder): fix some inconsistencies in the docs

crates/iota-transaction-builder/src/builder/mod.rs

@@ -441,6 +441,39 @@ impl<C, L> TransactionBuilder<C, L> {
 
     /// Transfer some coins to a recipient address. If multiple coins are
     /// provided then they will be merged.
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use iota_graphql_client::Client;
+    /// # use iota_transaction_builder::TransactionBuilder;
+    /// # use iota_types::Address;
+    ///
+    /// #[tokio::main(flavor = "current_thread")]
+    /// async fn main() -> eyre::Result<()> {
+    ///     let client = Client::new_devnet();
+    ///     let from_address = Address::from_hex(
+    ///         "0x611830d3641a68f94a690dcc25d1f4b0dac948325ac18f6dd32564371735f32c",
+    ///     )?;
+    ///     let to_address = Address::from_hex(
+    ///         "0x0000a4984bd495d4346fa208ddff4f5d5e5ad48c21dec631ddebc99809f16900",
+    ///     )?;
+    ///     let coin = ObjectId::from_str(
+    ///         "0x8ef4259fa2a3499826fa4b8aebeb1d8e478cf5397d05361c96438940b43d28c9",
+    ///     )?;
+    ///     let gas_coin = ObjectId::from_str(
+    ///         "0x0b0270ee9d27da0db09651e5f7338dfa32c7ee6441ccefa1f6e305735bcfc7ab",
+    ///     )?;
+    ///
+    ///     let mut builder = TransactionBuilder::new(from_address).with_client(client);
+    ///     builder
+    ///         .send_coins([coin], to_address, 50000000000u64)
+    ///         .gas(gas_coin)
+    ///         .gas_budget(1000000000);
+    ///     let txn = builder.finish().await?;
+    ///     Ok(())
+    /// }
+    /// ```
     pub fn send_coins<T: PTBArgumentList, U: PTBArgument>(
         &mut self,
         coins: T,