Document the geo-traits mod #1753

Job	Run time
build-benchmarks	2m 52s
check-features	18s
check-features-with-external-dependencies (-F gdal -F gdal/bindgen)	49s
check-features (-F csv)	13s
check-features-with-external-dependencies (-F geos)	35s
Lint and Test	8m 27s
check-features (-F flatgeobuf)	17s
check-features-with-external-dependencies (-F proj)	36s
check-features (-F flatgeobuf_async)	40s
check-features (-F geozero)	22s
check-features (-F ipc_compression)	13s
check-features (-F parquet)	21s
check-features (-F parquet_async)	30s
check-features (-F parquet_compression)	22s
check-features (-F polylabel)	15s
check-features (-F postgis)	36s
check-features (-F rayon)	23s
	17m 49s

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