Remove reference to obsolete BuildSnapshot()

	// Add a prebuilt module that the sdk will populate.

	//

	// Returning nil from this will cause the sdk module type to use the deprecated BuildSnapshot

	// method to build the snapshot. That method is deprecated because it requires the SdkMemberType

	// implementation to do all the word.

	//

	// Otherwise, returning a non-nil value from this will cause the sdk module type to do the

	// majority of the work to generate the snapshot. The sdk module code generates the snapshot

	// as follows:

	// The sdk module code generates the snapshot as follows:

	//

	// * A properties struct of type SdkMemberProperties is created for each variant and

	//   populated with information from the variant by calling PopulateFromVariant(SdkAware)