INTERVAL output format for iso_8601 is without dashes

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Page: https://www.postgresql.org/docs/18/datatype-datetime.html
Description:

https://www.postgresql.org/docs/current/datatype-datetime.html#DATATYPE-INTERVAL-OUTPUT

The output format for mixed Interval in style specification iso_8601 is
documented incorrectly.

The documentation says `P-1Y-2M3D​T-4H-5M-6S` while in reality there are no
dashes: `P1Y2M3D​T4H5M6S`