document the try_send_error!() macro

src/macros.rs

@@ -66,7 +66,28 @@ macro_rules! try_print {
 	};
 }
 
-/// Unwrap a `Result<T, E>`, if it's an error then let client know and return.
+/// Unwrap a Result. If it's Err then print the error and return a generic
+/// error message for the client.
+///
+/// # Arguments
+///
+/// * `$i:ident` : mio::Token to designate the client
+/// * `$e:expr` : Expression to evaluate, must return `Result<T, Box<dyn Error>>`
+///
+/// # Example
+///
+/// ```
+/// use std::fs::File;
+/// use mio::Token;
+/// use rude::result::RudeResult;
+/// use rude::try_send_error;
+///
+/// fn main() -> RudeResult<()> {
+///     let token = Token(12);
+///     let file = try_send_error!(token, File::open(file!()));
+///     Ok(())
+/// }
+/// ```
 #[macro_export]
 macro_rules! try_send_error {
 	($i:ident, $e:expr) => {