Improve documentation a bit

Author: david-sawatzke

src/hosted.rs

@@ -1,6 +1,9 @@
-//! This dynamically allocates an output buffer and writes out the data in a single call
+//! # Use ws2812 leds via spi on linux hosts
 //!
-//! Much better suited for linux or similar environments
+//! This dynamically allocates an output buffer and writes out the data in a single call.
+//! Much better suited for linux or similar environments, but may not always work
+//!
+//! Intendded for use with rppal or linux-embedded-hal
 
 use embedded_hal as hal;