Update and rename product owner to describe team

18F Methods should be led by a team of 2-3 product owners. This updated description reflects that.

PRODUCT_TEAM.md

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+# 18F Methods Product Team
+
+As a member of the 18F Methods Product Team, you will be expected to spend an average of two hours a week working towards the following objectives:
+
+## Objective A: Maintain the 18F Methods
+
+- Collaboratively set an achievable, year-long vision for the 18F Methods
+- Identify, prioritize, and address short-term goals and known issues
+- Establish a decision-making process(es) for merging contributions into the Methods 
+
+## Objective B: Ensure the 18F Methods support and reflect 18F’s current practices
+
+- Collect data around the value 18F Methods provides across the organization 
+- Revise and augment the Methods as needed, to keep in sync with 18F’s practice
+- Add to and maintain the connections between the Methods and other content (such as other guides and resources produced by 18F or issued by the government)
+
+## Objective C: Ensure usability and encourage adoption of the 18F Methods
+
+- In collaboration with TTS Outreach, promote the methods outside of 18F
+- Offer periodic support and solicit input for methods on venues like the UX-COP Mailing list
+- Optional: Conduct research around the use of the Methods in order to increase usability.