Document Emacs 23.2 changes.

Document Emacs 23.2 changes.

* functions.texi (Obsolete Functions): Document
set-advertised-calling-convention.

* minibuf.texi (Basic Completion): Document completion-in-region.
(Programmed Completion): Document completion-annotate-function.

* commands.texi (Reading One Event): Document read-key.
(Distinguish Interactive): Document KIND arg to
called-interactively-p.  Delete obsolete interactive-p.

* elisp.texi (Top): Update node description.

* misc.texi (Printing): Document htmlfontify-buffer.