tweaks and fix weird space

Author: RalfJung

src/libcore/marker.rs

@@ -633,7 +633,7 @@ unsafe impl<T: ?Sized> Freeze for &mut T {}
 /// This trait is automatically implemented for almost every type.
 ///
 /// [`mem::replace`]: ../../std/mem/fn.replace.html
- /// [`Pin<P>`]: ../pin/struct.Pin.html
+/// [`Pin<P>`]: ../pin/struct.Pin.html
 /// [`pin module`]: ../../std/pin/index.html
 #[stable(feature = "pin", since = "1.33.0")]
 #[cfg_attr(not(stage0), lang = "unpin")]

src/libcore/pin.rs

@@ -53,7 +53,7 @@
 //! cancels the effect of [`Pin<P>`]. For `T: Unpin`, `Pin<Box<T>>` and `Box<T>` function
 //! identically, as do `Pin<&mut T>` and `&mut T`.
 //!
-//! Note that pinning and `Unpin` only affect the pointed-to type, not the pointer
+//! Note that pinning and `Unpin` only affect the pointed-to type `P::Target`, not the pointer
 //! type `P` itself that got wrapped in `Pin<P>`. For example, whether or not `Box<T>` is
 //! `Unpin` has no effect on the behavior of `Pin<Box<T>>` (here, `T` is the
 //! pointed-to type).