* doc/lispref/buffers.texi (Read Only Buffers): Expand a bit on why
toggle-read-only should only be used interactively.
* lisp/files.el (toggle-read-only): Mention that it should only
be used interactively.
* lisp/emacs-lisp/bytecomp.el (byte-compile-interactive-only-functions):
Add toggle-read-only.