API Key Lookup Confusing

**Describe the bug**

When following the instructions on the README.md - [examples/python/tutorial/agent_team/adk-tutorial/readme.md](https://github.com/google/adk-docs/blob/main/examples/python/tutorial/agent_team/adk-tutorial/readme.md), in the [prerequisites](https://github.com/google/adk-docs/blob/main/examples/python/tutorial/agent_team/adk-tutorial/readme.md#prerequisites) section it includes instructions for looking up the API key in [Google AI Studio](https://aistudio.google.com/app/apikey). However, I believe in certain cases (not sure) the API key from the GCP project should be used rather than AI studio. Using AI studio results in permission errors.

**To Reproduce**

Steps to reproduce the behavior:

Follow the instructions on the readme, accessing the tutorial through [cloud shell](https://pantheon.corp.google.com/welcome?cloudshell=true).

**Expected behavior**

Advice should describe clearly how to find the API key for different configurations (this part I'm unclear on). If a user is running the tutorial through cloud shell then perhaps the API key is different? I'm not sure.