[Bug] Docs contradict the code: file format types, Flink procedures, CDC actions

[thswlsqls]

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Paimon version
master 1d368b4 (2.2-SNAPSHOT)

Compute Engine
Flink, Spark, core

Minimal reproduce step

• concepts/spec/fileformat.md: Lance and JSON tables list MULTISET, but LanceFileFormat and JsonFileFormat.validateDataType reject it; Lance and VortexFileFormat also reject VARIANT and inline BLOB, unlisted.
• temporal_functions.html: now() documented as TIMESTAMP_LTZ(3); Expression.NowExpression.outputType() returns TIMESTAMP(3).
• global-index/btree.mdx: btree-index.high-priority-pool-ratio and btree-index.compression-level (BTreeIndexOptions, read by BTreeGlobalIndexer) undocumented.
• kafka_sync_database.html, pulsar_sync_database.html: list --ignore_incompatible, but only MySqlSyncDatabaseActionFactory parses it.
• flink/procedures/compaction.md: CompactProcedure argument buckets undocumented.
• mysql-cdc.mdx, mysql_sync_database.html: --table_conf_by_table (MySqlSyncDatabaseActionFactory.printHelp) missing.
• flink/sql-query.mdx: split.target-size does not exist; CoreOptions defines source.split.target-size.
• spark/sql-write.md: WHEN NOT MATCHED BY SOURCE (PaimonMergeIntoResolver) missing from MERGE INTO syntax.
• flink/procedures/snapshots.md: order_than should be older_than (ExpireSnapshotsProcedure, ExpireChangelogsProcedure); expire_changelogs named-argument block is broken.
• flink/procedures/repair.md: `dry_run` = true is not a named argument; the remove_unexisting_manifests syntax block calls remove_unexisting_files.

What doesn't meet your expectations?
Following the docs fails at CREATE TABLE (unsupported types), at CDC job start (a now() column pre-created as TIMESTAMP_LTZ(3) fails the schema compatibility check) or with a Flink ValidationException (procedure examples).

Anything else?
N/A

Are you willing to submit a PR?

• I'm willing to submit a PR!