docs: Document GiST and SP-GiST geography indexes#661
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Document the gist/spgist index types for geography fields, the gist default, and the type/mixing restrictions, mirroring the spatial index support added in serverpod#5392. Also correct the spatial filter operator name (dwithin -> distanceWithin) to match the API, and note the fixed SRID (Geography.defaultSrid) and SQLite limitations on geography fields.
Include the verbatim code-generation error strings for invalid geography index types and for mixing geography with non-geography fields, so the behaviour matches what serverpod#5392 emits.
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Documents the new PostGIS geography support, mainly the GiST and SP-GiST spatial index work from serverpod/serverpod#5392, and fixes a couple of things in the existing geography docs while I was in there.
What's in here:
gistandspgisttypes,gistas the default when no type is given, the type restriction and the no-mixing rule, with the exact code-generation error strings quoted. Added anspgistexample and a note that SP-GiST needs a recent PostGIS.dwithin, but the real API isdistanceWithin. Checked against the serverpod source.Geography.defaultSrid, no per-column SRID yet) plus a SQLite limitation note (stored as EWKT text, spatial ops throw at query time).