[6.3] Update public RenderIndex.node initializer to accept an optional
#1375
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Explanation: Since
RenderIndex.Node’stypeproperty is optional, this updates theRenderIndex.Node's public initializer to accept an optional for that property. This is helpful for callers of the public API.Scope: Non-API-breaking change to a type in a
RenderIndex.Nodeinitializer.Issue: rdar://165803754.
Risk: Low. Does not change the behavior of DocC.
Testing: All existing unit tests pass.
Reviewer: @d-ronnqvist, @patshaughnessy
Original PR: #1360