Rollup merge of #40904 - rap2hpoutre:patch-1, r=steveklabnik

Add example to std::process::abort

This is a first step in order to complete this issue: https://github.com/rust-lang/rust/issues/29370
I submitted this PR with the help of @steveklabnik More info here: https://github.com/rust-lang/rust/issues/29370#issuecomment-290089330

It's my first PR on Rust, I'm learning how to contribute: Should I ping someone? I will post another PR with a more complicated example soon, I prefer send it separately (cause maybe I made some mistakes).

src/libstd/process.rs

@@ -1056,6 +1056,20 @@ pub fn exit(code: i32) -> ! {
 /// will be run. If a clean shutdown is needed it is recommended to only call
 /// this function at a known point where there are no more destructors left
 /// to run.
+///
+/// # Examples
+///
+/// ```no_run
+/// use std::process;
+///
+/// fn main() {
+///     println!("aborting");
+///
+///     process::abort();
+///
+///     // execution never gets here
+/// }
+/// ```
 #[stable(feature = "process_abort", since = "1.17.0")]
 pub fn abort() -> ! {
     unsafe { ::sys::abort_internal() };