Documentation feedback on /docs/topic/testing/index.md

### Documentation feedback

- Page title: Software Testing
- Page URL: https://cratedb.com/docs/guide/topic/testing/index.html
- Source: https://github.com/crate/cratedb-guide/blob/main/docs/topic/testing/index.md

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CrateDB is also supported by testcontainers-rs as a community module.

- https://github.com/testcontainers/testcontainers-rs
- https://rust.testcontainers.org/quickstart/community_modules/
- https://github.com/testcontainers/testcontainers-rs-modules-community/blob/main/src/cratedb/mod.rs

Thanks, @surister.

- https://github.com/testcontainers/testcontainers-rs-modules-community/pull/236
- https://github.com/testcontainers/testcontainers-rs-modules-community/pull/353