minor fixes to backend_ps

It would be nice if they would update their documents, since

    > the %%BeginFont and %%EndFont keywords are from their
    > document about embedding fonts.

Hey, give 'em a minute will you? They just released the 3.0 spec in
'92. It's going to take them a while to get the rest of their site
docs updated... :slight_smile:

JDH