Outdated Meta-data ERD

[fmbenhassine]

The ERD in the meta-data appendix is not conform to v5:

https://docs.spring.io/spring-batch/docs/current/reference/html/schema-appendix.html#metaDataSchemaOverview

The text was updated but not the diagram.

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Reference: https://stackoverflow.com/questions/76047708/meta-tables-appear-to-incorrect-in-spring-batch-docs