fix: contributing.md ToC remove unused entries

CONTRIBUTING.md

@@ -8,9 +8,7 @@ Here are our guidelines for contributing:
 * [Ways to Contribute](#ways)
 * [Issues and Bugs](#issue)
 * [Feature Requests](#feature)
-* [Improving Documentation](#docs)
-* [Unity Contribution Agreement](#cla)
-* [Pull Request Submission Guidelines](#submit-pr)
+* [Contributor License Agreement](#cla)
 
 ## <a name="coc"></a> Code of Conduct
 
@@ -33,6 +31,6 @@ If you would like to see a certain feature in the samples or implement one yours
 
 If you would like to implement a new feature then please also get in contact with us in the #dev-samples channel of our [Discord](https://discord.gg/buMxnnPvTb).
 
-## <a name="cla"></a> Contributor License Agreements
+## <a name="cla"></a> Contributor License Agreement
 
-When you open a pull request, you will be asked to enter into Unity's License Agreement which is based on The Apache Software Foundation's contribution agreement. We allow both individual contributions and contributions made on behalf of companies. We use an open source tool called CLA assistant. If you have any questions on our CLA, please submit an issue
+When you open a pull request, you will be asked to enter into Unity's License Agreement which is based on The Apache Software Foundation's contribution agreement. We allow both individual contributions and contributions made on behalf of companies. We use an open source tool called CLA assistant. If you have any questions on our CLA, please submit an issue