zfs-receive.8: properly unlight = in option setting

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Amanakis <gamanakis@gmail.com>
Reviewed-by: Ryan Moeller <freqlabs@FreeBSD.org>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes openzfs#13101

man/man8/zfs-receive.8

@@ -319,7 +319,7 @@ received as an encryption root, specify encryption properties in the same
 manner as is required for
 .Nm zfs Cm create .
 For instance:
-.Dl # Nm zfs Cm send Pa tank/test@snap1 | Nm zfs Cm recv Fl o Sy encryption Ns = Ns Sy on Fl o Sy keyformat=passphrase Fl o Sy keylocation Ns = Ns Pa file:///path/to/keyfile
+.Dl # Nm zfs Cm send Pa tank/test@snap1 | Nm zfs Cm recv Fl o Sy encryption Ns = Ns Sy on Fl o Sy keyformat Ns = Ns Sy passphrase Fl o Sy keylocation Ns = Ns Pa file:///path/to/keyfile
 .Pp
 Note that
 .Fl o Sy keylocation Ns = Ns Sy prompt