Some documentation still references the removed 'MaterialModule'

[alexjlockwood]

For example here: https://github.com/angular/material2/blob/master/src/lib/dialog/dialog.md

[devversion]

Thanks. We definitely need to switch all other instances of MaterialModule as well.

Not sure it would make sense to expose this variable so we can use it for the e2e-app and demo-app.

To make sure that no developer accidentally tries to use the exposed array of modules, we could prefix it with something special.

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