Fix spelling in client.rs
//! This is the main source file for the Rita client binary, by 'client' we mean 'not an exit server'
-//! all meshing and billing functionaltiy is contained in `rita_common` and is common to both rita and
+//! all meshing and billing functionality is contained in `rita_common` and is common to both rita and
//! `rita_exit`. The major difference is billing and connection code for the 'exit', the mandatory
//! vpn system integrated into the Althea network design, as well as API endpoints for a management
//! dashboard of router functions like wifi, which the exit is not expected to have.
