[PATCH 1 of 3] extdiff: register the configuration generated commands with a help category

[Yuya Nishihara]

On Tue, 04 Dec 2018 00:21:08 -0500, Matt Harbison wrote:
> # HG changeset patch
> # User Matt Harbison <matt_harbison at yahoo.com>
> # Date 1543888788 18000
> #      Mon Dec 03 20:59:48 2018 -0500
> # Node ID faaf565508106fb08151ee169b9aa4b937374cc1
> # Parent  bda0cb4839fb8618118e5dc7ab4b6742992eabd4
> extdiff: register the configuration generated commands with a help category

Queued this for stable, thanks.