ix.4: update crossreferences to ixgbe.4

Pull Request:	https://github.com/freebsd/freebsd-src/pull/1494

(cherry picked from commit cadb71e4b013925c145dd5e0726a3594111410cb)

share/man/man4/altq.4

@@ -143,7 +143,7 @@ They have been applied to the following hardware drivers:
 .Xr fxp 4 ,
 .Xr gem 4 ,
 .Xr igb 4 ,
-.Xr ixgbe 4 ,
+.Xr ix 4 ,
 .Xr jme 4 ,
 .Xr le 4 ,
 .Xr liquidio 4 ,

share/man/man4/ixl.4

@@ -209,7 +209,7 @@ When the driver is finding the last TX descriptor processed by the hardware,
 use a value written to memory by the hardware instead of scanning the
 descriptor ring for completed descriptors.
 Enabled by default; disable to mimic the TX behavior found in
-.Xr ixgbe 4 .
+.Xr ix 4 .
 .El
 .Sh SYSCTL PROCEDURES
 .Bl -tag -width indent

share/man/man4/netmap.4

@@ -827,7 +827,7 @@ On
 .Xr em 4 ,
 .Xr iflib 4
 .Pq providing Xr igb 4 and Xr em 4 ,
-.Xr ixgbe 4 ,
+.Xr ix 4 ,
 .Xr ixl 4 ,
 .Xr re 4 ,
 .Xr vtnet 4 .

share/man/man4/vlan.4

@@ -130,7 +130,7 @@ in hardware:
 .Xr cxgbe 4 ,
 .Xr em 4 ,
 .Xr igb 4 ,
-.Xr ixgbe 4 ,
+.Xr ix 4 ,
 .Xr jme 4 ,
 .Xr liquidio 4 ,
 .Xr msk 4 ,