Updates documentation for restrictions on Seata’s Spring Boot Starter

[linghengqian]

Fixes #29712.

Changes proposed in this pull request:

• Updates documentation for restrictions on Seata’s Spring Boot Starter and RPC.
  • Fixes the return value of "org.apache.shardingsphere.transaction.base.seata.at.SeataTransactionHolder.get()" is null #29681
  • Fixes shardingsphere-jdbc 5.4.0 AT transaction rollback not taking effect #29712
• Added a missing JavaDoc description For InlineExpressionParser. For Refactor InlineExpressionParser to prevent exposing Groovy API #30038 .

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