docs(overlay): Minor comment fix in overlay.ts

[NothingEverHappens]

cc @thekiba who helped me understand it

[crisbeto]

LGTM, but the message should be docs instead of fix.

[NothingEverHappens]

Thanks, updated

[zolee]

As I see line 32 looks like this after merge:
Note that Overlay is not scoped to the app root because the of the ComponentFactoryResolver

Please observ the bold part, it still incorrect I think, It simply should be of the.

[NothingEverHappens]

Ah, good catch, let me re-fix this

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