MRG: add genbank plant db to docs #6077

Job	Run time
test (beta)	1m 33s
test_all_features	14m 27s
test (stable)	1m 35s
test (windows)	4m 0s
test (macos)	1m 22s
Check	43s
coverage	10m 29s
Lints (beta)	36s
minimum_rust_version	7m 13s
Lints (stable)	52s
Publish (on tags, dry-run otherwise)	6m 27s
Check if wasm-pack builds a valid package for the sourmash crate	1m 22s
Check if cbindgen runs cleanly for generating the C headers	9m 15s
Run tests under wasm32-wasi	1m 12s
	1h 1m 6s

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