Info on Aya Expanse integration with WhatsApp.

[trentfowlercohere]

This PR introduces a new section to the Aya Expanse documentation, detailing the integration of Aya Expanse with WhatsApp. It provides instructions on how to communicate with the model via WhatsApp, including a link to initiate a chat and a reminder to verify important information due to potential hallucinations from large language models.

Changes:

• Added a new section titled "Aya Expanse Integration with WhatsApp" to the documentation.
• Included a callout box with important information about the service, including a link to Cohere's Terms of Use and Privacy Policy.
• Provided a step-by-step guide on how to start a WhatsApp chat with Aya Expanse, including instructions for both desktop and mobile users.
• Incorporated an image of the WhatsApp chat window for visual reference.
• Added subsections for potential messaging limitations, unavailable Aya capabilities, and troubleshooting tips.

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