man: zpool replace inconsistency

[Mike]

On page:

https://www.freebsd.org/cgi/man.cgi?query=zpool&apropos=0&sektion=0&manpath=FreeBSD+11.2-RELEASE+and+Ports&arch=default&format=html

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zpool replace [-f]	pool device [new_device]

	 Replaces old_device with new_device.  This is equivalent to attaching
	 new_device, waiting for it to resilver, and then detaching
	 old_device.


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The synopsis uses "pool device" while the description uses "old_device."