Apply suggestions from code review

Co-authored-by: Yuki Okushi <jtitor@2k36.org>

src/dot-operator.md

@@ -26,8 +26,9 @@ This just means that if `T` has a size parameter known at compile time, we "forg
 it for the purpose of resolving methods. For instance, this unsizing step can
 convert `[i32; 2]` into `[i32]` by "forgetting" the size of the array.
 
-Here is an example of the method lookup algorithm.
+Here is an example of the method lookup algorithm:
-```rust.ignore
+
+```rust,ignore
 let array: Rc<Box<[T; 3]>> = ...;
 let first_entry = array[0];
 ```
@@ -38,21 +39,23 @@ trait - the compiler will convert `array[0]` into `array.index(0)`. Now, the
 compiler checks to see if `array` implements `Index`, so that we can call the
 function.
 
-First, the compiler checks if `Rc<Box<[T; 3]>>` implements `Index`, but it
+Then, the compiler checks if `Rc<Box<[T; 3]>>` implements `Index`, but it
 does not, and neither do `&Rc<Box<[T; 3]>>` or `&mut Rc<Box<[T; 3]>>`. Since
 none of these worked, the compiler dereferences the `Rc<Box<[T; 3]>>` into
-`Box<[T; 3]>` and tries again. `Box<[T; 3]>`, `&Box<[T; 3]>` and `&mut Box<[T; 3]>`
+`Box<[T; 3]>` and tries again. `Box<[T; 3]>`, `&Box<[T; 3]>`, and `&mut Box<[T; 3]>`
 do not implement `Index`, so it dereferences again. `[T; 3]` and its autorefs
 also do not implement `Index`. We can't dereference `[T; 3]`, so the compiler
 unsizes it, giving `[T]`. Finally, `[T]` implements `Index`, so we can now call the
 actual `index` function.
 
-Consider the following more complicated example of the dot operator at work.
+Consider the following more complicated example of the dot operator at work:
-```rust.ignore
+
+```rust
 fn do_stuff<T: Clone>(value: &T) {
     let cloned = value.clone();
 }
 ```
+
 What type is `cloned`? First, the compiler checks if we can call by value.
 The type of `value` is `&T`, and so the `clone` function has signature
 `fn clone(&T) -> T`. We know that `T: Clone`, so the compiler finds that
@@ -60,15 +63,16 @@ The type of `value` is `&T`, and so the `clone` function has signature
 
 What would happen if the `T: Clone` restriction was removed? We would not be able
 to call by value, since there is no implementation of `Clone` for `T`. So the
-compiler tries to call by autoref. In this case, the function has signature
+compiler tries to call by autoref. In this case, the function has the signature
 `fn clone(&&T) -> &T` since `Self = &T`. The compiler sees that `&T: Clone`, and
 then deduces that `cloned: &T`.
 
-Here is another example where the autoref behaviour is used to create some subtle
+Here is another example where the autoref behavior is used to create some subtle
-effects.
+effects:
-```rust.ignore
-use std::sync::Arc;
 
+```rust
+# use std::sync::Arc;
+#
 #[derive(Clone)]
 struct Container<T>(Arc<T>);
 
@@ -77,11 +81,13 @@ fn clone_containers<T>(foo: &Container<i32>, bar: &Container<T>) {
     let bar_cloned = bar.clone();
 }
 ```
+
 What types are `foo_cloned` and `bar_cloned`? We know that `Container<i32>: Clone`,
 so the compiler calls `clone` by value to give `foo_cloned: Container<i32>`.
 However, `bar_cloned` actually has type `&Container<T>`. Surely this doesn't make
 sense - we added `#[derive(Clone)]` to `Container`, so it must implement `Clone`!
-Looking closer, the code generated by the `derive` macro is (roughly)
+Looking closer, the code generated by the `derive` macro is (roughly):
+
 ```rust.ignore
 impl<T> Clone for Container<T> where T: Clone {
     fn clone(&self) -> Self {
@@ -89,6 +95,7 @@ impl<T> Clone for Container<T> where T: Clone {
     }
 }
 ```
+
 The derived `Clone` implementation is
 [only defined where `T: Clone`][clone],
 so there is no implementation for `Container<T>: Clone` for a generic `T`. The
@@ -96,17 +103,19 @@ compiler then looks to see if `&Container<T>` implements `Clone`, which it does.
 So it deduces that `clone` is called by autoref, and so `bar_cloned` has type
 `&Container<T>`.
 
-We can fix this by implementing `Clone` manually without requiring `T: Clone`.
+We can fix this by implementing `Clone` manually without requiring `T: Clone`:
-```rust.ignore
+
+```rust,ignore
 impl<T> Clone for Container<T> {
     fn clone(&self) -> Self {
         Self(Arc::clone(&self.0))
     }
 }
 ```
+
 Now, the type checker deduces that `bar_cloned: Container<T>`.
 
-[fqs]: https://doc.rust-lang.org/nightly/book/ch19-03-advanced-traits.html#fully-qualified-syntax-for-disambiguation-calling-methods-with-the-same-name
+[fqs]: ../book/ch19-03-advanced-traits.html#fully-qualified-syntax-for-disambiguation-calling-methods-with-the-same-name
 [method_lookup]: https://rustc-dev-guide.rust-lang.org/method-lookup.html
-[index]: https://doc.rust-lang.org/std/ops/trait.Index.html
+[index]: ../std/ops/trait.Index.html
-[clone]: https://doc.rust-lang.org/std/clone/trait.Clone.html#derivable
+[clone]: ../std/clone/trait.Clone.html#derivable