Adding Cohere source attribution

[jlinsdell-cohere]

Pinecone has asked us to add source attribution in our guides so they can track usage through the guide.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}