Fix typos in the Memory and Buffers section of the docs home (#1795)

arrow/src/lib.rs

@@ -72,8 +72,8 @@
 //!
 //! Data in [`Array`](array::Array) is stored in [`ArrayData`](array::ArrayData), that in turn
 //! is a collection of other [`ArrayData`](array::ArrayData) and [`Buffers`](buffer::Buffer).
-//! [`Buffers`](buffer::Buffer) is the central struct that array implementations use keep allocated memory and pointers.
-//! The [`MutableBuffer`](buffer::MutableBuffer) is the mutable counter-part of[`Buffer`](buffer::Buffer).
+//! [`Buffers`](buffer::Buffer) is the central struct that array implementations use to keep allocated memory and pointers.
+//! The [`MutableBuffer`](buffer::MutableBuffer) is the mutable counter-part of [`Buffer`](buffer::Buffer).
 //! These are the lowest abstractions of this crate, and are used throughout the crate to
 //! efficiently allocate, write, read and deallocate memory.
 //!