Minor corrections in docs for std::process::Child

Author: dirk

src/libstd/process.rs

@@ -48,13 +48,15 @@ use thread::{self, JoinHandle};
 /// assert!(ecode.success());
 /// ```
 ///
-/// # Safety
+/// # Note
 ///
 /// Take note that there is no implementation of
 /// [`Drop`](../../core/ops/trait.Drop.html) for child processes, so if you
-/// not ensure the `Child` has exited (through `kill`, `wait`, or
-/// `wait_with_output`) then it will continue to run even after the `Child`
-/// handle to it has gone out of scope.
+/// do not ensure the `Child` has exited then it will continue to run, even
+/// after the `Child` handle to the child process has gone out of scope.
+///
+/// Calling `wait` (or other functions that wrap around it) will make the
+/// parent process wait until the child has actually exited before continuing.
 #[stable(feature = "process", since = "1.0.0")]
 pub struct Child {
     handle: imp::Process,