Update DeriveActiveEnum doc #4427

Job	Run time
Unit Test	3m 17s
Clippy	1m 19s
Examples (examples/actix_example)	2m 27s
Init	6s
Rustfmt	19s
Examples (examples/axum_example)	2m 27s
Examples (examples/basic)	1m 15s
Examples (examples/graphql_example)	2m 57s
Examples (examples/jsonrpsee_example)	3m 1s
Examples (examples/poem_example)	2m 38s
Examples (examples/proxy_gluesql_example)	1m 24s
Examples (examples/rocket_example)	3m 0s
Examples (examples/rocket_okapi_example)	3m 11s
Examples (examples/salvo_example)	2m 46s
Examples (examples/seaography_example)	2m 31s
Examples (examples/tonic_example)	2m 27s
Compile PostgreSQL (tokio, native-tls)	2m 58s
Compile PostgreSQL (tokio, rustls)	3m 7s
Compile SQLite (async-std, native-tls)	2m 59s
CLI	0s
Compile MySQL (actix, native-tls)	2m 47s
Compile SQLite (async-std, rustls)	3m 0s
Compile MySQL (actix, rustls)	3m 6s
Issues Matrix	0s
Issues	0s
Postgres (14, tokio, native-tls)	6m 57s
Postgres (16, tokio, native-tls)	7m 12s
SQLite (async-std, native-tls)	4m 48s
SQLite (async-std, rustls)	4m 22s
MySQL (lts, actix, native-tls)	3m 19s
MariaDB (lts, actix, native-tls)	2m 49s
MySQL (5.7, actix, native-tls)	3m 37s
	1h 26m 6s

Provide feedback