Adding required declarations to the Trademark Policy, similar to the requirements for a DMCA notice. Some formatting changes show up in the diff, but there are no deletions in this PR, only additions of the declarations mentioned above.

Adding required declarations to the Trademark Policy, similar to the requirements for a DMCA notice. Some formatting changes show up in the diff, but there are no deletions in this PR, only additions of the declarations mentioned above.

Originally posted by @bluemazzoo in https://github.com/github/site-policy/pull/120