Re: tooltip-mode docstring

[Luc Teirlinck]

Nick Roberts wrote:

   I think it's reasonable to start with certain assumptions.  It's a
   doc string, not a primer (or legal document).  tool-bar-mode
   doesn't explain what a tool bar is, menu-bar-mode what a menu-bar is...

"Tooltip" is sometimes misunderstood to mean the help message instead
of the window showing that message.  The purpose of my proposed doc
fix is to prevent that confusion.

Sincerely,

Luc.