docs(dialog): emphasize clicking on backdrop in disableClose docs

[crisbeto]

Mentions the backdrop explicitly in the disableClose docs in order to avoid confusion.

Fixes #11750.

[jelbourn]

LGTM

[marc-wilson]

Is there a way to handle this a little bit better than updating the documentation? It still seems like a design flaw. It should operate just like MatSelect or MatMenu. There is no backdrop with those components but when a user clicks outside of it, it automatically closes. The MatDialog should have the same behavior if disableClose is used. Having a backdrop and disabling the ability to close the dialog serve two different use cases and shouldn't be dependent on each other. I understand there is a workaround by adding a custom backdropClass, but it's a workaround. disableClose and hasBackdrop are two different things and shouldn't be dependent on each other.

[jelbourn]

It's a supported case to turn off the backdrop and let users interact with the page behind the dialog; it doesn't really have anything to do with disableClose at all.

[marc-wilson]

@jelbourn That is also a valid case which is why disableClose should work regardless of the value of hasBackdrop

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