docs: fix typo for ios + link of egghead (#2532)(by @doanhtu07)

Author: doanhtu07

CONTRIBUTING.md

@@ -27,7 +27,7 @@ yarn example android
 To run the example app on iOS:
 
 ```sh
-yarn example android
+yarn example ios
 ```
 
 Make sure your code passes TypeScript and ESLint. Run the following to verify:
@@ -84,7 +84,7 @@ The `package.json` file contains various scripts for common tasks:
 
 ### Sending a pull request
 
-> **Working on your first pull request?** You can learn how from this _free_ series: [How to Contribute to an Open Source Project on GitHub](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github).
+> **Working on your first pull request?** You can learn how from this _free_ series: [How to Contribute to an Open Source Project on GitHub](https://egghead.io/courses/how-to-contribute-to-an-open-source-project-on-github).
 
 When you're sending a pull request: