Update the Community Advocates Page with Forum Link

Why is this change being made?

Describe in detail answer to question on why this change is being proposed, in accordance with our value of Transparency:

This change is being made so that readers can easily access the forum from the Expertise area of the Community Advocates handbook.

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what