doc: Clarify how user space is experimental.
Clarify that the use of the user space datapath with non DPDK devices is
considered experimental.
Fixes: (doc: Remove experimental warning for DPDK.)
@@ -41,8 +41,8 @@ The included Linux kernel module supports Linux 3.10 and up.
Open vSwitch can also operate entirely in userspace without assistance from
a kernel module. This userspace implementation should be easier to port than
the kernel-based switch. OVS in userspace can access Linux or DPDK devices.
-Note Open vSwitch with Linux devices in userspace is considered experimental
-and comes with a cost in performance.
+Note Open vSwitch with userspace datapath and non DPDK devices is considered
+experimental and comes with a cost in performance.
What's here?
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