[PR PATCH] Update the help text for dbcheck

[github at samba.org]

There is a new pull request by jmhunter against master on the Samba Samba Github repository

https://github.com/jmhunter/samba master
https://github.com/samba-team/samba/pull/128

Update the help text for dbcheck
Update the help text for dbcheck, to make its behaviour clear (in particular with reference to the difference between specifying "--yes" on the command line, and answering "yes"/"all" to each individual question)

Following on from discussion on samba at lists.samba.org mailing list (subject 'samba-tool dbcheck on 4.7.5, after bug 13228')

A patch file from https://github.com/samba-team/samba/pull/128.patch is attached
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