[FLINK-22970][docs][table] The documentation for TO_TIMESTAMP UDF h…

…as an incorrect description (apache#16141)

docs/data/sql_functions.yml

@@ -484,7 +484,7 @@ temporal:
     table: toTimestampLtz(NUMERIC, PRECISION)
     description: "Converts a epoch seconds or epoch milliseconds to a TIMESTAMP_LTZ, the valid precision is 0 or 3, the 0 represents TO_TIMESTAMP_LTZ(epochSeconds, 0), the 3 represents TO_TIMESTAMP_LTZ(epochMilliseconds, 3)."
   - sql: TO_TIMESTAMP(string1[, string2])
-    description: "Converts date time string string1 with format string2 (by default: 'yyyy-MM-dd HH:mm:ss') under the session time zone (specified by TableConfig) to a timestamp."
+    description: "Converts date time string string1 with format string2 (by default: 'yyyy-MM-dd HH:mm:ss') under the 'UTC+0' time zone to a timestamp."
   - sql: CURRENT_WATERMARK(rowtime)
     description: |
       Returns the current watermark for the given rowtime attribute, or `NULL` if no common watermark of all upstream operations is available at the current operation in the pipeline.