typo(docs): fix some docs problem

[LGDHuaOPER]

• print(adbc_driver_flightsql.__version__) throw error.
• fix Can not found function 'sum_merge'
• fix Can not found function 'sum_union'
• fix errCode = 2, detailMessage = Table testdb.test_partition is not a dynamic partition table. Use command `HELP ALTER TABLE` to see how to change a normal table to a dynamic partition table.
• docs change SHOW INDEX FROM idx_name into SHOW INDEX FROM table_name
• fix errCode = 2, detailMessage = Can not drop key column when table has value column with REPLACE aggregation method

Versions

• [x] dev
• [x] 3.0
• [x] 2.1
• [x] 2.0

Languages

• [x] Chinese
• [x] English

Docs Checklist

• [x] Checked by AI
• [ ] Test Cases Built

[KassieZ]

please resolve the conflicts first

[LGDHuaOPER]

please resolve the conflicts first

done

[LGDHuaOPER]

I have resolved the conflicts. Thanks! @KassieZ