fix: typos (#8)

Author: chriswblake

.github/steps/1-step.md

@@ -55,7 +55,7 @@ Before we start developing and reviewing, let's take a moment to understand the
 
 ### ⌨️ Activity: Ask Copilot for a review
 
-Lets add a simple banner feature for teachers to make announcements and then ask Copilot for feedback.
+Let's add a simple banner feature for teachers to make announcements and then ask Copilot for feedback.
 
 1. In VS Code, create a new branch with the following name.
 

.github/steps/2-step.md

@@ -22,7 +22,7 @@ For more information, see the [GitHub Copilot code review documentation](https:/
 
 ### ⌨️ Activity: Request a review
 
-1. If needed, open a another web browser tab and navigate to this exercise repository.
+1. If needed, open another web browser tab and navigate to this exercise repository.
 
 1. Start a new pull request. Enter the following details and click the **Create pull request** button.