[fix](doc) zh: unix-timestamp missing semicolon; DESC-TABLE wrong db qualifier and stale IndexKeysType

[boluor]

Summary

Two ZH-only single-line doc bugs surfaced by the doc verifier on Doris 4.1.1:

unix-timestamp.md (zh)

select unix_timestamp('1007-11-30 10:30:19') was missing the trailing semicolon. The whole 举例 section is one giant \``sqlblock where statements are separated by;; without the semicolon the result-table ASCII art (+---+ | … | +---+) gets concatenated onto the SQL and sent to the cluster, which trips on |` ("extraneous input"). The EN version has the semicolon.

DESC-TABLE.md (zh)

Two issues in example 2:

1. The example uses DESC demo.test_table ALL;, but neither this page nor its prior CREATE TABLE ever creates a demo database. The demo. qualifier was a leftover stand-in and contradicts the previous example (DESC test_table;). The <db_name>.<table_name> syntax is already documented in the Syntax block on line 16, so dropping the qualifier doesn't lose pedagogical value.
2. The expected-output table shows IndexKeysType = DUP_KEYS, but the same page's CREATE TABLE uses UNIQUE KEY(user_id), so the real value is UNIQUE_KEYS. The DUP_KEYS row was stale from when the example may have used a DUPLICATE KEY table.

Verification

Verified both flows end-to-end on a fresh Doris 4.1.1 single-node cluster:

mysql> select unix_timestamp('1007-11-30 10:30:19');
+---------------------------------------+
| unix_timestamp('1007-11-30 10:30:19') |
+---------------------------------------+
|                                     0 |
+---------------------------------------+

mysql> DESC test_table ALL;
+------------+---------------+---------+-------------+--------------+------+-------+---------+-------+---------+------------+-------------+
| IndexName  | IndexKeysType | Field   | Type        | InternalType | Null | Key   | Default | Extra | Visible | DefineExpr | WhereClause |
+------------+---------------+---------+-------------+--------------+------+-------+---------+-------+---------+------------+-------------+
| test_table | UNIQUE_KEYS   | user_id | bigint      | bigint       | No   | true  | NULL    |       | true    |            |             |
|            |               | name    | varchar(20) | varchar(20)  | Yes  | false | NULL    | NONE  | true    |            |             |
|            |               | age     | int         | int          | Yes  | false | NULL    | NONE  | true    |            |             |
+------------+---------------+---------+-------------+--------------+------+-------+---------+-------+---------+------------+-------------+

Test plan

• Verified select unix_timestamp('1007-11-30 10:30:19'); returns 0 on Doris 4.1.1
• Verified DESC test_table ALL; on the schema defined earlier in the page returns the corrected table contents
• Both fences are unbroken markdown (no fence-parsing changes needed beyond removing/renaming the existing content)

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