revert change to docs/source/user-guide/sql/scalar_functions.md

Author: alamb

docs/source/user-guide/sql/scalar_functions.md

@@ -2450,6 +2450,7 @@ date_bin(interval, expression, origin-timestamp)
 - **interval**: Bin interval.
 - **expression**: Time expression to operate on. Can be a constant, column, or function.
 - **origin-timestamp**: Optional. Starting point used to determine bin boundaries. If not specified defaults 1970-01-01T00:00:00Z (the UNIX epoch in UTC). The following intervals are supported:
+
   - nanoseconds
   - microseconds
   - milliseconds