add docs to gate action

Author: hectorsector

responses/08.0_validate.md

@@ -1,8 +1,8 @@
 ### Validation
 
-The events that can act as triggers help Learning Lab know when something happens. However, sometimes knowing it happened isn't enough. For example, if we ask a learner to commit a function to a file, we can get a trigger that they've committed to a branch. But we would receive the same trigger, even if they committed to a different file!
+The events that can act as triggers help Learning Lab know when something happens. However, sometimes knowing it happened isn't enough. For example, if we ask a learner to commit a function to a file, we'll get a trigger that they've committed to a branch. But we would receive the same trigger, even if they committed to a different file!
 
-Learning Lab uses **gates** to be validate the user's completion of a step. A `gate` is a Learning Lab action. Gates are conditionals, and they behave much like a conditional in Javascript. Let's add a `gate`, we'll specify its options in a later step.
+Course authors can use **gates** to be validate the user's completion of a step. A [:book: `gate`](https://github.github.com/learning-lab-equipment/#/actions/gate/) is a Learning Lab action. Gates are conditionals, and they behave much like a conditional in Javascript. Let's add a `gate`, we'll specify its options in a later step.
 
 ## Step 9: Add a gate