CFC: Correct example in section 5.1 of Activity Streams core to use proper context syntax

Issue 505 in the Activity Streams 2.0 repository notes that the example 
in section 5.1 "Compact URIs" uses the AS2 alias 'id' for the '@id' 
type, although AS2 is not used in the example:

https://github.com/w3c/activitystreams/issues/505

To correct this, I've added a PR for an erratum to give the correct 
syntax in the example:

https://github.com/w3c/activitystreams/pull/546

Example 29 uses `id` as an alias for the `@id` property even though the Activity Streams 2.0
context has not been used, so that alias is not set up. The correct code would be:

     ```json
     {
         "@context": {
             "ex":"http://example.org/",
             "term": {
                 "@type": "@id",
                 "@id": "ex:term"
             }
         },
         "term": "ex:Foo"
     }
     ```

This is a call for consensus on applying this erratum. If there are no 
objections on the PR, issue, or in this email thread by EOD Oct 24 2025 
AOE, I will merge the PR to the errata, and apply the change to the 
editor's draft.

Thanks!

Evan