Fixed typos in Step 1 and Step 2 (#33)

Author: mickeygousset

.github/steps/1-preparing.md

@@ -31,7 +31,7 @@ As you work, you'll find GitHub Copilot can help out in several places across th
 
 Let's start up our development environment, use copilot to learn a bit about the project, and then give it a test run.
 
-1. Right-click the below button to open the **Create Codespace** page in a new tab. Use the default configuration.
+1. Left-click the below button to open the **Create Codespace** page in a new tab. Use the default configuration.
 
    [![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/{{full_repo_name}}?quickstart=1)
 

.github/steps/2-first-introduction.md

@@ -29,7 +29,7 @@ In short, you can think of Copilot like a very focused coworker. To be effective
    > Where could this bug be coming from?
    > ```
 
-1. Now that we know the issue is in the `src/appy.py` file and the `signup_for_activity` method, let's follow Copilot's recommendation and go fix it (semi-manually). We'll start with a comment and let Copilot finish the correction.
+1. Now that we know the issue is in the `src/app.py` file and the `signup_for_activity` method, let's follow Copilot's recommendation and go fix it (semi-manually). We'll start with a comment and let Copilot finish the correction.
 
    1. In VS Code, select the file **Explorer tab** to show the project files and open the `src/app.py` file.