clarify a docstring sentence
//! is always a multiple of the chunk shape. Chunk shape dimensions must be powers of 2, which allows for efficiently
//! calculating a chunk key from any point in the chunk.
//!
-//! If you require iteration over large, but very sparse regions, you might be better off using an `OctreeChunkIndex` to track
-//! the set of occupied chunks. Traversing that index can be faster than doing hash map lookups on all of the possible chunks
-//! in a region.
+//! If you require iteration over large, but very sparse regions, you might want an additional `OctreeChunkIndex` to track the
+//! set of occupied chunks. Traversing that index can be faster than doing hash map lookups on all of the possible chunks in a
+//! region.
//!
//! # Chunk Storage
//!
