Final attempt at making miri work

Author: chorman0773

library/core/src/arch.rs

@@ -95,11 +95,13 @@ pub fn breakpoint() {
 /// ## Example
 /// ```
 /// #![feature(return_address)]
-/// # #[cfg(not(miri))] // FIXME: Figure out how to make miri work before stabilizing this macro
-/// # {
+///
+/// # fn run_test() {
 /// let addr = core::arch::return_address!();
 /// println!("Caller is {addr:p}");
 /// # }
+/// # #[cfg(not(miri))] // FIXME: Figure out how to make miri work before stabilizing this macro
+/// # run_test()
 /// ```
 #[unstable(feature = "return_address", issue = "154966")]
 #[allow_internal_unstable(core_intrinsics)]