Grammer & Style Tweaks as per feedback

guides/CHANGELOG.md

@@ -1,4 +1,5 @@
-*   New section in Testing Guide - Testing Time Sensitive Code
+*   New section in Testing Guide - Testing Time-Dependent Code
+
     *Gaurish Sharma*
 
 *   Add code of conduct to contributing guide

guides/source/testing.md

@@ -1237,8 +1237,8 @@ Testing Time-Dependent Code
 ---------------------------
 
 You might have code in your rails app, that is time sensitive. For example,
-you want to give some gifts to users but only after they have been a member for 1month
-which is calculated from their activation date. to test such business logic in your tests
+you want to give some gifts to users but only after they have been a member for month
+which is calculated from their activation date. To test such business logic in your tests
 you will need to time travel in your tests.
 
 Fortunately, Rails provides inbuild helper methods which allow you time travel in your test code,
@@ -1251,7 +1251,7 @@ Here is an example using [`travel_to`](http://api.rubyonrails.org/classes/Active
 user = User.create(name: 'Gaurish', activation_date: Date.new(2004, 10, 24))
 assert_not user.applicable_for_gifting? # `activation_date` => Wed, 24 Nov 2004
 travel_to Date.new(2004, 11, 24) do
-  assert_equal Date.new(2004, 10, 24), user.activation_date # inside the trave_to block `Date.current` is mocked
+  assert_equal Date.new(2004, 10, 24), user.activation_date # inside the travel_to block `Date.current` is mocked
   assert user.applicable_for_gifting? # `activation_date` => Sun, 24 Oct 2004
 end
 assert_equal Date.new(2004, 10, 24), user.activation_date # Outside the block, changed are undone