Update swift_import docs and add warning
#1186
Merged
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Updates the
swift_importdocumentation to provide more information on theswiftinterfaceattribute. This attribute is required when importing pre-built Swift targets across Xcode and/or OS versions.Additionally, adds a warning when
swiftinterfaceis used alongsideswiftmoduleas this used to just dropswiftinterfacesilently. We'll make this a failure in a new major version to not break users.