[RFA 3/3] NEWS and documentation for / (slash) command.

[Eli Zaretskii]

> From: Philippe Waroquiers <philippe.waroquiers@skynet.be>
> Cc: Philippe Waroquiers <philippe.waroquiers@skynet.be>
> Date: Sat, 13 Apr 2019 21:00:16 +0200
> 
> +* New commands
> +
> +/SETTING... COMMAND
> +  The / command temporarily changes some settings according to SETTING
> +  to run COMMAND.
     ^^^^^^^^^^^^^^
I'd say "for the duration of COMMAND" instead.

> +@cindex Settings
> +@cindex Temporarily change settings

By convention, index entries are not capitalized, to avoid problems
with sorting them alphabetically (which produces locale-dependent
results).

> +The following table gives the list of settings that the @code{/} command
> +can temporarily change.  The first column gives the letter sequence
> +identifying the setting corresponding to the command in the second column.
> +The third column gives the type of the setting, and list the different
> +possible values for the enumeration settings.  Note that the below table
> +is produced by the @code{help /} command.
> +
> +@smallexample
> +@c In the 'doc' build directory, the following can be produced by:
> +@c ../../gdb/gdb -q --nx  -ex 'set width 80' -ex 'set height 0' -ex 'help /' -ex quit |
> +@c   sed -e '1,/The temporarily changeable settings are:/d' -e ':a;s/^\( *\) /@\1/;ta' -e 's/^/@exdent /'
> +@c Maybe this could/should be automated by the doc Makefile ?
> +@exdent /Be       set backtrace past-entry       Boolean on|off
> +@exdent /Bl       set backtrace limit            Unsigned integer (0 means unlimited)

Please rewrite this as a @multitable, so that it looks good in all
formats.

Thanks.