fix(doc): remove a duplicate table row

Signed-off-by: LenaLenaPan <120552185+LenaLenaPan@users.noreply.github.com>

docs/en_US/guide/sources/plugin/sql.md

@@ -82,7 +82,6 @@ The target database url
 | mysql      | mysql://user:test@140.210.204.147/user?parseTime=true |
 | sql server | sqlserver://username:password@140.210.204.147/testdb  |
 | postgres   | postgres://user:pass@localhost/dbname                 |
-| postgres   | postgres://user:pass@localhost/dbname                 |
 | sqlite     | sqlite:/path/to/file.db                               |
 
 ### internalSqlQueryCfg
@@ -157,4 +156,4 @@ The cache configuration lies in the `sql.yaml`.
 
 - cache: bool value to indicate whether to enable cache.
 - cacheTtl: the time to live of the cache in seconds.
-- cacheMissingKey: whether to cache nil value for a key.
+- cacheMissingKey: whether to cache nil value for a key.