[ES|QL] Update function metadata (#199586)

This PR updates the function definitions and inline docs based on the
latest metadata from Elasticsearch.

packages/kbn-esql-validation-autocomplete/src/definitions/generated/scalar_functions.ts

@@ -1294,7 +1294,7 @@ const dateDiffDefinition: FunctionDefinition = {
   validate: undefined,
   examples: [
     'ROW date1 = TO_DATETIME("2023-12-02T11:00:00.000Z"), date2 = TO_DATETIME("2023-12-02T11:00:00.001Z")\n| EVAL dd_ms = DATE_DIFF("microseconds", date1, date2)',
-    'ROW end_23="2023-12-31T23:59:59.999Z"::DATETIME,\n  start_24="2024-01-01T00:00:00.000Z"::DATETIME,\n    end_24="2024-12-31T23:59:59.999"::DATETIME\n| EVAL end23_to_start24=DATE_DIFF("year", end_23, start_24)\n| EVAL end23_to_end24=DATE_DIFF("year", end_23, end_24)\n| EVAL start_to_end_24=DATE_DIFF("year", start_24, end_24)',
+    'ROW end_23=TO_DATETIME("2023-12-31T23:59:59.999Z"),\n  start_24=TO_DATETIME("2024-01-01T00:00:00.000Z"),\n    end_24=TO_DATETIME("2024-12-31T23:59:59.999")\n| EVAL end23_to_start24=DATE_DIFF("year", end_23, start_24)\n| EVAL end23_to_end24=DATE_DIFF("year", end_23, end_24)\n| EVAL start_to_end_24=DATE_DIFF("year", start_24, end_24)',
   ],
 };