bug#18026: 24.4.50; doc string of `delete-whitespace-rectangle': contiguous, not continuous

[Lars Ingebrigtsen]

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

> Subject line says it all.  The text would be clearer with "contiguous"
> instead of "continuous".  It's not clear what "continuous whitespace"
> means.

I've now pushed a fix.

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