Add generated documentation for network zones #1867

Job	Run time
Code	6m 58s
System (1.21.x, cluster, dir)	12m 2s
Client (1.21.x, ubuntu-latest)	26s
System (1.21.x, cluster, btrfs)	13m 32s
Documentation	7m 33s
Client (1.21.x, macos-latest)	25s
System (1.21.x, cluster, lvm)	12m 44s
Client (1.21.x, windows-latest)	2m 57s
System (1.21.x, cluster, zfs)	12m 43s
System (1.21.x, cluster, ceph)	16m 4s
System (1.21.x, cluster, random)	11m 32s
System (1.21.x, standalone, dir)	21m 35s
System (1.21.x, standalone, btrfs)	21m 19s
System (1.21.x, standalone, lvm)	39m 44s
System (1.21.x, standalone, zfs)	38m 48s
System (1.21.x, standalone, ceph)	1h 14m 46s
System (1.21.x, standalone, random)	21m 50s
System (stable, cluster, dir)	10m 53s
System (stable, standalone, dir)	20m 55s
System (tip, cluster, dir)	11m 40s
System (tip, standalone, dir)	22m 7s
	6h 20m 33s

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