Update parsers documentation

**Feature request**
It would be great to have serialization for api.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_serialization` with default `false`.

Start by locating the parser documentation and the configuration entry point for `enable_serialization`; no file or test is named in the issue. Confirm where API serialization is handled, then verify that the option defaults to `false` and that the documented behavior matches the implemented behavior.

Written by the indexing model from the issue text.