Remove duplicate word from addr docs

library/core/src/ptr/mut_ptr.rs

@@ -187,7 +187,7 @@ impl<T: ?Sized> *mut T {
     ///
     /// This is similar to `self as usize`, which semantically discards *provenance* and
     /// *address-space* information. However, unlike `self as usize`, casting the returned address
-    /// back to a pointer yields yields a [pointer without provenance][without_provenance_mut], which is undefined
+    /// back to a pointer yields a [pointer without provenance][without_provenance_mut], which is undefined
     /// behavior to dereference. To properly restore the lost information and obtain a
     /// dereferenceable pointer, use [`with_addr`][pointer::with_addr] or
     /// [`map_addr`][pointer::map_addr].