docs: DQN tutorial — clarify Driver pattern and link to Drivers tutorial/API

[rakshita0299]

What

• Add a brief note that the data-collection loop is a Driver and link to the Drivers tutorial + API.

Why

• Aligns terminology for beginners and directs readers to the dedicated Drivers tutorial, per issue Tutorial 1: Train a Deep Q Network with TF-Agents and the use of a driver #554.

How verified

• Opened the notebook in Colab; markdown renders as expected; no code changes.

Links

• Fixes Tutorial 1: Train a Deep Q Network with TF-Agents and the use of a driver #554

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