bug#1526: 22.2.50; doc strings: menu-bar-mode scroll-bar-mode tool-bar-mode

[Lars Magne Ingebrigtsen]

Reiner Steib <reinersteib+gmane@imap.cc> writes:

> maybe the doc strings of menu-bar-mode, scroll-bar-mode and
> tool-bar-mode should be unified with regards to the numeric arguments.
> Currently, some of the doc strings mention positive, some negative
> arguments:
>
> | (menu-bar-mode &optional arg)
> | [...] 
> | With a numeric argument, if the argument is positive,
> | turn on menu bars; otherwise, turn off menu bars.
>
> | (scroll-bar-mode &optional flag)
> | [...]
> | With a numeric argument, if the argument is negative,
> | turn off scroll bars; otherwise, turn on scroll bars.
>
> | (tool-bar-mode &optional arg)
> | [...]
> | With numeric arg, display the tool bar if and only if arg is positive.

The first two had already been unified, but I fixed up the third one.

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