Use AS2 specific language for post types

[rhiaro]

[tantek]

I think this is editorial as it should not change the actual meaning or implementations thereof.

[tantek]

Also this seems like a subset of issue #2

[tantek]

Has normative implications, so dropping the editorial label.

[tantek]

Feedback is to reference this right in the Abstract where it says "post type".

[tantek]

Now that AS2 has been resolved to go to PR, we know what terms it has and thus which I can re-use / reference accordingly.

[tantek]

For reference:

• Activity types (like, etc.) https://www.w3.org/TR/activitystreams-vocabulary/#activity-types
• Object types (article, note, etc.) https://www.w3.org/TR/activitystreams-vocabulary/#object-types

[tantek]

I think the best way to resolve this is by adding a list / table per #15