Add an example in churn extension

[Augie Fackler]

Looks good and I'll apply it, but please note the thoughts here for future patches: https://www.mercurial-scm.org/wiki/ContributingChanges#Emailing_patches <https://www.mercurial-scm.org/wiki/ContributingChanges#Emailing_patches>

Thanks!

> On Sep 17, 2020, at 09:44, Stéphane Blondon <stephane.blondon at gmail.com> wrote:
> 
> Hello,
> 
> this patch (done with 'hg export') adds an example in the docstring
> `churn()` function, in order the user can see it with:
> hg help churn
> 
> I subscribed to this mailing list if there are remarks about the patch.
> 
> Regards
> -- 
> Stéphane
> <churn.patch>_______________________________________________
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