tidb: add the refresh stats statement

fix: update warnings

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

fix: remove unnessary part

fix: update privileges

fix: correct the link

fix: update link style

fix: make lint happy

fix: make lint happy

fix : make lint happy

Author: 0xPoe

TOC.md

@@ -864,6 +864,7 @@
       - [`PREPARE`](/sql-statements/sql-statement-prepare.md)
       - [`QUERY WATCH`](/sql-statements/sql-statement-query-watch.md)
       - [`RECOVER TABLE`](/sql-statements/sql-statement-recover-table.md)
+      - [`REFRESH STATS`](/sql-statements/sql-statement-refresh-stats.md)
       - [`RENAME USER`](/sql-statements/sql-statement-rename-user.md)
       - [`RENAME TABLE`](/sql-statements/sql-statement-rename-table.md)
       - [`REPLACE`](/sql-statements/sql-statement-replace.md)