add documentation hidden property

[robfrank]

No description provided.

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[gramian]

The ALTER PROPERTY reference entry has also a list of attributes where hidden would need to be added.

Regarding the description itself: maybe the

"when using SELECT * FROM ..."

needs to be rephrased to something like

"when using * in projections such as in SELECT * FROM ...",

to emphasize that hidden means for all * projection occurances?

Otherwise LGTM.