Clean up README

Author: MilesCranmer

README.md

@@ -5,7 +5,7 @@
 [![Build Status](https://github.com/MilesCranmer/BaseType.jl/actions/workflows/CI.yml/badge.svg?branch=main)](https://github.com/MilesCranmer/BaseType.jl/actions/workflows/CI.yml?query=branch%3Amain)
 [![Aqua](https://raw.githubusercontent.com/JuliaTesting/Aqua.jl/master/badge.svg)](https://github.com/JuliaTesting/Aqua.jl)
 
-This package defines a function `base_numeric_type` that
+This package defines a tiny function `base_numeric_type` that
 extracts the base numeric type from a possible container type `T`.
 
 - `base_numeric_type(::Type{T}) where {T}`
@@ -26,9 +26,10 @@ For example,
 ```
 
 Packages should write a method to `base_numeric_type`
-the base numeric type of a container
-is not the **first parametric type**, which is the default.
+when the base numeric type of a container type
+is not the first parametric type. Otherwise,
+the default method will already be valid.
 
-However, this is not needed for container types
-that inherit from `AbstractArray{T}`, where `T`
+Furthermore, this is not needed for container types
+that inherit from `AbstractArray{T}`, as `T`
 will be taken as the base numeric type.