[CfC] Erratum for ActivityPub on the definition of `inbox` the property

Issue #289 of the ActivityPub GitHub repository notes the inexact and 
asymmetrical language used for defining the `inbox` and `outbox` 
collections:

https://github.com/w3c/activitypub/issues/289

To resolve this, there is a proposed erratum for Section 4.1 to bring 
the definition of the `inbox` property closer to that of the `outbox` 
property:

  * In section 4.1 "Actor objects", the definition of "inbox" should
    read, "An OrderedCollection comprised of all the messages received
    by the actor; see 5.2 Inbox."

We usually handle approval of errata in our synchronous meetings, which 
takes a lot of time and focus away from other topics that require more 
immediate presence and conversation. In speaking with the chairs and 
others in the issue triage meeting, we think that handling this task 
through the CFC decision-making process will be more efficient.

So, I am seeking consensus to add this erratum to our errata page for 
ActivityPub. Please reply either to the GitHub issue or here on the 
mailing within 14 days of this message.

Evan