Stop suggesting adding p-name e-content

[aaronpk]

p-name — if your post has a name, use this classname. Otherwise, (if for example the post is a note), either leave it off or apply to the same element as e-.

This should be updated to suggest only adding the name property for articles

[gRegorLove]

Closed by #98

[gRegorLove]

Reopening because there's still a validation message here that directs to add p-name e-content.

We should double-check the logic here for what an "invalid" name is and what message to show (if any). The mf2 parsing spec has changed to reduce how often a name is parsed implicitly. For example, other p- properties will prevent an implicit name. If notes are published with p-content like the how-to, there will be no name and this validator will indicate an "invalid" name.

I ran into this testing my post that has no p-name.