influxdb/docs/regenerating_flatbuffers.md

Regenerating Flatbuffers code

When updating the version of the flatbuffers Rust crate used as a dependency in the IOx workspace, the generated Rust code in generated_types/src/wal_generated.rs also needs to be updated in sync.

To update the generated code, edit generated_types/regenerate-flatbuffers.sh and set the FB_COMMIT variable at the top of the file to the commit SHA of the same commit in the flatbuffers repository where the flatbuffers Rust crate version was updated. This ensures we'll be using the same version of flatc that the crate was tested with.

Then run the generated_types/regenerate-flatbuffers.sh script and check in any changes. Check the whole project builds.