update fork button instructions

README.md

@@ -32,9 +32,12 @@ local environment. Let's quickly review this process:
 
 ![fork button](https://curriculum-content.s3.amazonaws.com/fork-link.png)
 
-Alternatively, you can click on the GitHub 'Octocat' button in the upper right corner of this lesson to see this assignment in GitHub, then click GitHub's **Fork** button in the upper right corner of the page. Choose to fork to your personal account if prompted.
+> **Reminder:** This buttton does the same thing as [forking in GitHub][forking] (via the **Octocat** button).
+> We recommend using the **Fork** button in Canvas.
 
-3) Once the forking process is complete, you should be looking at your personal copy of the assignment on GitHub
+[forking]: https://guides.github.com/activities/forking/
+
+3) Choose to fork to your personal account if prompted. Once the forking process is complete, you should be looking at your personal copy of the assignment on GitHub
 
 4) Click **Code**, choose **SSH**, then click the _clipboard_ icon to copy the information we'll need about this repository