bug#35651: 26.2; doc of `delimit-columns-*' commands

[Lars Ingebrigtsen]

Drew Adams <drew.adams@oracle.com> writes:

> The doc strings are woefully inadequate.  "Prettify all columns..."  is
> unclear.  The behavior - what the commands do - is not described at all.
>
> And there is nothing in any manual about these commands either.  Users
> are forced to consult the code to have any idea of what this "delimit
> columns" stuff is all about.

That was a pretty minimal doc string.  I've now adapted some of the text
from the comments in the file as a doc string.

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