minor grammar fixes

Author: johnpapa

public/docs/ts/latest/tutorial/toh-pt2.jade

@@ -273,14 +273,14 @@ include ../../../../_includes/_util-fns
 
     When our app loads we see a list of heroes, but a hero is not selected. 
     The `selectedHero` is `undefined`. 
-    That’s why we'll' see the following error in the browser’s console:
+    That’s why we'll see the following error in the browser’s console:
     ```
     EXCEPTION: TypeError: Cannot read property 'name' of undefined in [null]
     ``` 
     Remember that we are displaying `selectedHero.name` in the template. 
     This name property does not exist because `selectedHero`itself is undefined. 
 
-    We'll' address this problem by keeping the hero detail out of the DOM until there is a selected hero.
+    We'll address this problem by keeping the hero detail out of the DOM until there is a selected hero.
 
     We wrap the HTML hero detail content of our template with a `<div>`. 
     Then we add the `ng-if` built-in directive and set it to the `selectedHero` property of our component.
@@ -374,7 +374,7 @@ include ../../../../_includes/_util-fns
 
   :markdown
     Notice in the template that the `ng-class` name is surrounded in square brackets (`[]`).  
-    This is the syntax for a Property Binding, a binding in which data flow one way 
+    This is the syntax for a Property Binding, a binding in which data flows one way 
     from the data source (the `getSelectedClass`) to a property of the `ng-class` directive. 
 
   .alert.is-helpful