[FLINK-40514][docs][pipeline-connector/doris] Align Doris pipeline connector option table with implementation

[suntectec]

What is the purpose of this pull request?

This is a docs-only fix for FLINK-40514. The Doris pipeline connector option table has drifted from the implementation in both the English and the Chinese docs, so users reading it would get the wrong types and defaults, and six supported options were not documented at all.

Brief change log

• auto-redirect: documented as String, but declared as booleanType() in DorisDataSinkOptions. Corrected to Boolean.
• charset-encoding: documented as Boolean with default false, but declared as stringType() with default "UTF-8". Corrected both the type and the default.
• Removed the leftover Java string concatenation (\n" + ") that leaked into the English sink.ignore.update-before description.
• Documented the six options declared in DorisDataSinkFactory#optionalOptions() but missing from the table: sink.enable-2pc, sink.check-interval, sink.buffer-size, sink.buffer-count, sink.label-prefix and sink.use-cache. The new rows are appended at the end of the sink.* group, and their descriptions are copied from the corresponding ConfigOption descriptions.
• Updated both docs/content/docs/connectors/pipeline-connectors/doris.md and docs/content.zh/docs/connectors/pipeline-connectors/doris.md.

No code change is involved. Existing option descriptions were intentionally left untouched so that this change stays limited to the inaccuracies reported in the JIRA issue.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

The tables were cross-checked against the code: every ConfigOption declared in DorisDataSinkOptions now appears in the option table of both documents, and the only remaining doc entries that have no ConfigOption counterpart are the pipeline-level type / name rows and the sink.properties.* / table.create.* prefix rows.

Documentation

• Does this pull request introduce a new feature? (no)

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[yuxiqian]

Looks good. Thank you for the nice work!