docs(contributing): fix toc for "Common Issues" section (#36041)

### Issue # (if applicable)
N/A

Closes
N/A

### Reason for this change

Fix the incorrect table of contents for "Common Issues" as it was wrong. 
Fix the old name "Troubleshooting," as the link was broken.


### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: aki-kii

CONTRIBUTING.md

@@ -47,7 +47,7 @@ Any code that you submit will be released under that license.
 - [Changing the Cloud Assembly Schema](#changing-cloud-assembly-schema)
 - [Feature Flags](#feature-flags)
 - [Versioning and Release](#versioning-and-release)
-- [Troubleshooting](#troubleshooting)
+- [Common Issues](#common-issues)
 - [Debugging](#debugging)
   - [Connecting the VS Code Debugger](#connecting-the-vs-code-debugger)
   - [Run a CDK unit test in the debugger](#run-a-cdk-unit-test-in-the-debugger)