(defvar help-fns-describe-function-functions nil
"List of functions to run in help buffer in `describe-function'.
Those functions will be run after the header line and argument
-list was inserted, and before the documentation is be inserted.
+list was inserted, and before the documentation is inserted.
The functions will be called with one argument: the function's symbol.
They can assume that a newline was output just before they were called,
and they should terminate any of their own output with a newline.