[BitBoard] Build out the documentation

bitboard/src/library.rs

@@ -3,7 +3,7 @@
 //! # The Bitboard Library
 //!
 //! This module implements a collection of commonly used bitboards that can be
-//! looked up efficiently as needed.
+//! looked up efficiently.
 //!
 //! The `library()` method returns a static instance of a `Library`, which
 //! provides getters for all available bitboards.