events: Document unintentionally exposed API fields.
events: Document unintentionally exposed API fields.

It's a bug that these are sent in event payloads; I'll open an issue
for resolving that issue.  For now we document them mainly to make our
tests pass.

zulip/zulip,andersk/zulip,andersk/zulip,rht/zulip,showell/zulip,andersk/zulip,hackerkid/zulip,showell/zulip,punchagan/zulip,brainwane/zulip,rht/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,hackerkid/zulip,showell/zulip,punchagan/zulip,punchagan/zulip,andersk/zulip,hackerkid/zulip,eeshangarg/zulip,showell/zulip,andersk/zulip,hackerkid/zulip,rht/zulip,hackerkid/zulip,brainwane/zulip,andersk/zulip,kou/zulip,brainwane/zulip,brainwane/zulip,zulip/zulip,hackerkid/zulip,eeshangarg/zulip,showell/zulip,kou/zulip,brainwane/zulip,kou/zulip,kou/zulip,andersk/zulip,zulip/zulip,kou/zulip,punchagan/zulip,zulip/zulip,hackerkid/zulip,kou/zulip,brainwane/zulip,showell/zulip,brainwane/zulip,punchagan/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,zulip/zulip,punchagan/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,kou/zulip,showell/zulip,rht/zulip,punchagan/zulip,rht/zulip