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Document minkowski_sum / minkowski_difference (GeoDMS #917, 20.18.0) New pages for the eight operators that take the Minkowski kernel as an ARGUMENT instead of carrying it in the operator name: both signatures, the six variant names, the single-ring restriction, the origin convention (an off-centre kernel displaces the result), and what each of the four backends actually does. Boost-polygon-functions was the canonical description of the suffix grammar and was stale twice over: it still promised the suffixes could be combined "twice" (partitioned_union_polygon_d16D_i16D), a form no longer registered, and it described twelve kernels that are now depreciated. Rewritten around a migration table, and honest about the cost -- the replacement materialises one intermediate polygon attribute that the fused operator did not. polygon-inflated / polygon-deflated get a depreciation banner naming the replacement call, and keep their coordinate-precision warning, which applies unchanged. polygon-operators lists the eight new names and strikes the 48 old ones. geos_buffer and bg_buffer_multi_polygon now point at minkowski_sum, since a buffer is the Minkowski sum with a disc and the split between them is worth stating.