Fix typos

Author: nkaretnikov

src/fn/diverging.md

@@ -12,7 +12,7 @@ As opposed to all the other types, this one cannot be instantiated, because the
 set of all possible values this type can have is empty. Note, that it is
 different from the `()` type, which has exactly one possible value.
 
-For example, this functions returns as usual, although there is no information
+For example, this function returns as usual, although there is no information
 in the return value.
 
 ```rust
@@ -22,7 +22,7 @@ fn some_fn() {
 
 fn main() {
     let a: () = some_fn();
-    println!("This functions returns and you can see this line.")
+    println!("This function returns and you can see this line.")
 }
 ```