Fixed a typo in the lib.rs docs.
//! # Smithay: the Wayland compositor smithy
//!
-//! This crate is a general framework for build wayland compositors. It currently focuses on low-level,
+//! This crate is a general framework for building wayland compositors. It currently focuses on low-level,
//! helpers and abstractions, handling most of the system-level and wayland protocol interactions.
//! The window management and drawing logic is however at the time not provided (but helpers for this
//! are planned for future version).
