Merge pull request #804 from Abrasha/fix/typo-in-tutorial

Fix a typo, add missing space in code snippet

Author: heathermiller

tutorials/tour/_posts/2017-02-13-pattern-matching.md

@@ -114,7 +114,7 @@ In the `case Email(email, _, _) if importantPeopleInfo.contains(email)`, the pat
 You can match on the type like so:
 ```tut
 abstract class Device
-case class Phone(model: String) extends Device{
+case class Phone(model: String) extends Device {
   def screenOff = "Turning screen off"
 }
 case class Computer(model: String) extends Device {

tutorials/tour/_posts/2017-02-13-traits.md

@@ -60,7 +60,7 @@ iterator.next()  // prints 1
 This `IntIterator` class takes a parameter `to` as an upper bound. It `extends Iterator[Int]` which means that the `next` method must return an Int.
 
 ## Subtyping
-Subtypes of traits can be used where a the trait is required.
+Where a given trait is required, a subtype of the trait can be used instead.
 ```tut
 import scala.collection.mutable.ArrayBuffer