Additional Breaking changes in 2.0.0 beta-12

[Stexxen]

Bug, feature request, or proposal:

Change to Release Notes for 2.0.0 beta-12

What is the current behavior?

Additional Breaking changes not mentioned in the Release Notes.

1. OverlayContainer has moved from @angular/material to @angular/cdk/overlay
2. MD_DIALOG_DATA has been removed completely and MAT_DIALOG_DATA must be used instead.

The OverlayContainer move also means the Theming guide requires updating as well

[irowbin]

There is some CSS issues in dialog. Why i am seeing this overflow-x?

[EdricChan03]

@irowbin Post your problem as a separate issue please.

[willshowell]

@Stexxen Your first two were already mentioned as breaking changes.

You are right about the theming guide needing an update.

[Stexxen]

@willshowell I understand what you are saying, but these 2 items specifically broke my code when upgrading from beta-11 to beta-12, so IMHO they are breaking changes in beta-12.
But if this is how breaking changes are normally documented, then I will be more wary in future.

[willshowell]

Ah, sure. Both of those were deprecated in previous releases and listed as breaking changes, but were not immediately removed.

@jelbourn any clue why the BREAKING CHANGES message in #7112 did not get auto-added to the changelog?

[jelbourn]

Must be some issue w/ the changelog script, I'll add those

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