Make DocId a default formatter

[joelmartinez]

The DocId is a critical link for working with docs.microsoft.com ... right now, we just instruct any CI that runs in "frameworks mode" that they should include -lang docid, because otherwise the member and type signature will not be generated.

We should accept this fact, and make docid included in the default list.

Steps:

1. Add an instance of DocIdFormatter to these two arrays.
2. Update the en.expected* entries here for the integration tests.
3. Verify that adding -lang docid will not break existing CI scripts that will already be passing in that parameter.