Clean up misc. module doccomments

src/client.rs

@@ -1,5 +1,6 @@
-//! Module containing a high-level client for interacting with an MPD server.
-//! It provides methods for common operations such as playing, pausing, and
+//! A high-level client for interacting with an Mpd server.
+//!
+//! The client provides methods for common operations such as playing, pausing, and
 //! managing the playlist, and returns the expected response types directly
 //! from its methods.