guide-ownership.md, guide-testing.md: fix typos

Signed-off-by: Philipp Gesang <phg@phi-gamma.net>

src/doc/guide-ownership.md

@@ -416,7 +416,7 @@ note: `car` moved here because it has type `Car`, which is non-copyable
 ```
 
 We need our `Car` to be pointed to by multiple `Wheel`s. We can't do that with
-`Box<T>`, because it has a single owner. We can do t with `Rc<T>` instead:
+`Box<T>`, because it has a single owner. We can do it with `Rc<T>` instead:
 
 ```rust
 use std::rc::Rc;

src/doc/guide-testing.md

@@ -357,7 +357,7 @@ Let's finally check out that third section: documentation tests.
 
 Nothing is better than documentation with examples. Nothing is worse than
 examples that don't actually work, because the code has changed since the
-documentation has been written. To this end, Rust supports automaticaly
+documentation has been written. To this end, Rust supports automatically
 running examples in your documentation. Here's a fleshed-out `src/lib.rs`
 with examples: