Apply suggestions from code review

RalfJung · crlf0710 · web-flow · commit d148b40a2714 · 2019-05-06T23:18:53.000+08:00
Co-Authored-By: crlf0710 &lt;crlf0710@gmail.com&gt;
diff --git a/reference/src/layout/pointers.md b/reference/src/layout/pointers.md
@@ -51,7 +51,7 @@ struct DynObject {
 }
 ```
 
-> **note**: In the layout equivalence of `&dyn mut Trait` the field `data` is of the type `*mut u8`.
+> **note**: In the layout of `&dyn mut Trait` the field `data` is of the type `*mut u8`.
 
 The layout of `&[T]` is the same as that of:
 ```rust
@@ -62,7 +62,7 @@ struct Slice<T> {
 }
 ```
 
-> **note**: In the layout equivalence of `&mut [T]` the field `ptr` is of the type `*mut T`.
+> **note**: In the layout of `&mut [T]` the field `ptr` is of the type `*mut T`.
 
 The layout of `&str` is the same as that of `&[u8]`, and the layout of `&mut str` is
 the same as that of `&mut [u8]`.

Original file line number	Diff line number	Diff line change
`@@ -51,7 +51,7 @@ struct DynObject {`
`51`	`51`	`}`
`52`	`52`	```
`53`	`53`
`54`		-> note: In the layout equivalence of `&dyn mut Trait` the field `data` is of the type `*mut u8`.
	`54`	+> note: In the layout of `&dyn mut Trait` the field `data` is of the type `*mut u8`.
`55`	`55`
`56`	`56`	The layout of `&[T]` is the same as that of:
`57`	`57`	```rust
`@@ -62,7 +62,7 @@ struct Slice<T> {`
`62`	`62`	`}`
`63`	`63`	```
`64`	`64`
`65`		-> note: In the layout equivalence of `&mut [T]` the field `ptr` is of the type `*mut T`.
	`65`	+> note: In the layout of `&mut [T]` the field `ptr` is of the type `*mut T`.
`66`	`66`
`67`	`67`	The layout of `&str` is the same as that of `&[u8]`, and the layout of `&mut str` is
`68`	`68`	the same as that of `&mut [u8]`.