Documentation: Add entry for gen-hostnqn

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>

diff --git a/Documentation/nvme-gen-hostnqn.txt b/Documentation/nvme-gen-hostnqn.txt
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+nvme-gen-hostnqn(1)
+===================
+
+NAME
+----
+nvme-gen-hostnqn - Generate a host NVMe Qualified Name
+
+SYNOPSIS
+--------
+[verse]
+'nvme gen-hostnqn'
+
+DESCRIPTION
+-----------
+Generate a random host NQN in the form:
+nqn.2014-08.org.nvmexpress:NVMf:uuid:1b4e28ba-2fa1-11d2-883f-0016d3cca427
+and prints it to stdout.
+
+OPTIONS
+-------
+No options needed
+
+EXAMPLES
+--------
+nvme gen-hostnqn
+
+NVME
+----
+Part of the nvme-user suite