Special operators docs inaccurate

[Stephen J. Turnbull]

Thank you, Aidan, for updating the manuals.

Anybody with some desire to contribute, feel free to submit patches to
improve the accuracy of the manuals.  Issue #755.  Try to review whole
sections, and mention what you've reviewed in the issue as a comment.

Note that 100% accuracy is not needed; if you can do better than
what's there, please do!

Also, if you don't know exactly what a special operator is *yet* but
what like to help, feel free to ask here.  There's an exact
definition, and it's fairly easy (but tedious) to apply, so the more
eyes and keyboards, the better!

http://tracker.xemacs.org/XEmacs/its/issue755

Aidan Kehoe writes:

 > Unfortunately, the manuals have some inaccuracy about what exactly is a
 > special operator and what isn’t, and I didn’t correct that.
 > 
 > APPROVE COMMIT
 > 
 > NOTE: This patch has been committed.