tests: Don't ignore the doc tests, just don't run one of them.

src/lib.rs

@@ -14,14 +14,14 @@
 //!
 //! Yep — and you only need **one line of code** to make it happen:
 //!
-//! ```rust,ignore
+//! ```rust
 //! use pretty_assertions::{assert_eq, assert_ne};
 //! ```
 //!
 //! <details>
 //! <summary>Show the example behind the screenshots above.</summary>
 //!
-//! ```rust,ignore
+//! ```rust,no_run
 //! // 1. add the `pretty_assertions` dependency to `Cargo.toml`.
 //! // 2. insert this line at the top of each module, as needed
 //! use pretty_assertions::{assert_eq, assert_ne};
@@ -50,7 +50,7 @@
 //!
 //! Also add `#[cfg(test)]` to your `use` statements, like this:
 //!
-//! ```rust,ignore
+//! ```rust
 //! #[cfg(test)]
 //! use pretty_assertions::{assert_eq, assert_ne};
 //! ```