added fixes to address comments

Signed-off-by: Nathan Hsieh <hsieh.nathan@gmail.com>

docs/sources/userguide/dockerimages.md

@@ -168,7 +168,7 @@ update and create images.
 1. We can update a container created from an image and commit the results to an image.
 2. We can use a `Dockerfile` to specify instructions to create an image.
 
-Test your understanding [here](/userguide/level1)!
+To learn more, check out the [Dockerfile tutorial](/userguide/level1).
 
 ### Updating and committing an image
 
@@ -480,9 +480,9 @@ We can then create a container from our new image.
 > To help you write a clear, readable, maintainable `Dockerfile`, we've also
 > written a [`Dockerfile` Best Practices guide](/articles/dockerfile_best-practices).
 
-### Test your understanding
+### More
 
-See how well you understand the material by taking [this short quiz](/userguide/level1)!
+To learn more, check out the [Dockerfile tutorial](/userguide/level1).
 
 ## Setting tags on an image
 

docs/sources/userguide/level1.md

@@ -4,9 +4,9 @@ page_keywords: documentation, docs, the docker guide, docker guide, docker, dock
 
 <a title="back" class="btn btn-primary back" href="/userguide/dockerimages/#creating-our-own-images">Back</a>
 
-# Test Yourself
+# Dockerfile Tutorial
 
-## Test your Dockerfile skills - Level 1
+## Test your Dockerfile knowledge - Level 1
 
 ### Questions
 

docs/sources/userguide/level2.md

@@ -4,9 +4,9 @@ page_keywords: documentation, docs, the docker guide, docker guide, docker, dock
 
 <a title="back" class="btn btn-primary back" href="/userguide/dockerimages/#creating-our-own-images">Back</a>
 
-#Test Yourself
+#Dockerfile Tutorial
 
-## Test your Dockerfile skills - Level 2
+## Test your Dockerfile knowledge - Level 2
 
 ### Questions: