Minor errata item (typo)

Easy thing we should clean up, there's a grammatical error in the definition of the @keycols attribute on simpletables:
http://docs.oasis-open.org/dita/dita/v1.3/errata01/os/complete/part1-base/langRef/attributes/simpletableAttributes.html

@keycolDefines the column that can contains headings for each row. No value indicates no key column. When present, the numerical value causes the specified column to be treated as a vertical header. 
Just need to remove the "can" from "that can contains".

Regards,
Robert D. Anderson 
DITA-OT lead and Co-editor DITA 1.3 specification,
Digital Services Group 

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