Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  8fc7c8d336e2ec640ab3a60186db93881e8e31b0

Document the fact that ve.dm.MetaItem#replaceWith takes a plain object

Also encourage callers to pass plain objects unless they know what
they're doing; it's almost always wrong to pass in a MetaItem.

Change-Id: I8e8ef8ac7f77ec9f929d797e467b9c9d1140d721