bug#42776: Obscure documentation of `edebug-form-data' in edebug.el

[Alan Mackenzie <acm@muc.de>]

Hello, Emacs.

In the master branch:

The doc string of edebug-form-data begins thusly:

     "A list of entries associating symbols with buffer regions.
      Each entry is an `edebug--form-data' struct with fields:
      SYMBOL, BEGIN-MARKER, and END-MARKER.  The markers
      are at the beginning and end of an entry level form and SYMBOL is
      a symbol that holds all edebug related information for the form on its
      property list."
 
The following extract from this is obscure: "...the beginning and end of
an entry level form ...."

What in heaven or earth is an "entry level form"?  What is it for?

Less major questions are: What is the nature of the "association" of the
symbols with the buffer regions?  Which buffer gets its regions
associated?

It seems the only way to make sense of this doc string is by reading
edebug.el's source to find out what it means.  This isn't what doc
strings are supposed to be for.

This is a bug.

-- 
Alan Mackenzie (Nuremberg, Germany).