[PATCH] Minor NEWS rearrangement

[Eli Zaretskii]

> From: Tom Tromey <tromey@adacore.com>
> Cc: Tom Tromey <tromey@adacore.com>
> Date: Fri, 14 Jun 2019 12:31:30 -0600
> 
> I noticed that a NEWS item about Python scripting changes appeared
> between an item about a convenience function and an item about a
> convenience variable.  I think it's better for the latter to be next
> to each other.

Fine with me, thanks.