cpubits: move usage example to README.md

Author: tarcieri

cpubits/README.md

@@ -15,6 +15,18 @@ Implemented as `macro_rules!`.
 
 [Documentation][docs-link]
 
+## Example
+
+Below is a basic example of how you can use the `cpubits!` macro:
+
+```rust
+cpubits::cpubits! {
+    16 => { pub type Word = u16; }
+    32 => { pub type Word = u32; }
+    64 => { pub type Word = u64; }
+}
+```
+
 ## License
 
 Licensed under either of:

cpubits/src/lib.rs

@@ -14,22 +14,10 @@
 //! - `64`
 //!
 //! This matches the available options for `target_pointer_width` in `rustc`:
+//!
 //! ```text
 //! expected values for `target_pointer_width` are: `16`, `32`, and `64`
 //! ```
-//!
-//! # Example
-//!
-//! See the [`cpubits`] macro itself for more detailed usage examples including other syntax
-//! variations.
-//!
-//! ```
-//! cpubits::cpubits! {
-//!     16 => { pub type Word = u16; }
-//!     32 => { pub type Word = u32; }
-//!     64 => { pub type Word = u64; }
-//! }
-//! ```
 
 // End of toplevel rustdoc, beginning of macro documentation. We put the detailed docs on the macro
 // itself so we can re-export it, and people can easily get to these docs from the re-exported