[Samba] Error in man page

[Miguel Medalha]

> A few months ago I reported an error on a Samba man page available 
online. 
> The error is still there. Can someone with the appropriate privileges 
> correct it? Thank you.
> 
> "vfs_shadow_copy - Make a Samba share read only for a specified time 
period"
> 
> This is obviously wrong.
> 
> The error is present in the following pages:
> 
> https://www.samba.org/samba/docs/man/manpages/
> 
> https://www.samba.org/samba/docs/man/manpages/vfs_shadow_copy.8.html
>

I just noticed that the error still persists on the current samba packages. 
I looked into my Samba 4.2.2 and the error is there.