[data-shapes] Use start instead of left in `sh:order` to adapt to non-ltr languages (#304)

YoucTagh has just created a new issue for https://github.com/w3c/data-shapes:

== Use start instead of left in `sh:order` to adapt to non-ltr languages ==
In the `sh:order` description, I think it is better to use **start** instead of **left** to adapt to non-ltr languages.

Please view or discuss this issue at https://github.com/w3c/data-shapes/issues/304 using your GitHub account


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