docs: document ALTER ROUTINE LOAD property changes#3988
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### What problem does this PR solve? Issue Number: N/A Related PR: apache#64878 Problem Summary: Keep ALTER ROUTINE LOAD target-table switching composable with existing job and Kafka/Kinesis data-source properties while removing unrelated Kafka ALTER atomicity, Cloud progress staging, partial-update compatibility, and RoutineLoadDesc persistence changes from this PR. ### Release note ALTER ROUTINE LOAD supports SET TARGET TABLE together with supported job and Kafka/Kinesis data-source properties. ### Check List (For Author) - Test: - Unit Test: Focused Routine Load FE UT, 34 tests passed - Build: ./build.sh --fe -j48 - Regression test: Added Kafka end-to-end coverage; not run locally because an isolated FE/BE/Kafka cluster was not started - Behavior changed: Yes. Paused single-table Kafka and Kinesis Routine Load jobs can switch target tables while preserving progress. - Does this need documentation: Yes. apache/doris-website#3988
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Summary
ALTER ROUTINE LOAD ... SET TARGET TABLEsyntax introduced by [feature](routineload) Add routine load target-table alter support doris#64878 and its Kafka-only target-table constraint.Related PR
Version scope
This feature targets the Doris
masterbranch, so this PR updates only the current/dev English, Chinese, and Japanese pages. The 4.x, 3.x, and 2.1 versioned pages are intentionally unchanged.Validation
git diff --checknode scripts/docs-governance/report.js --changed --format github(exit code 0; Japanese update reports 0 findings)Versions
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