Update s2builder.h comments #419
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kIntersectionSnapRadius is not defined anywhere. The comments from s2edge_crossings.h for kIntersectionMergeRadius indicate this is what it meant.
// This value can be used as the S2Builder snap_radius() to ensure that edges // that have been displaced by up to kIntersectionError are merged back // together again. For example this can happen when geometry is intersected // with a set of tiles and then unioned. It is equal to twice the // intersection error because input edges might have been displaced in // opposite directions.
constexpr S1Angle kIntersectionMergeRadius = 2 * kIntersectionError;