Merge branch 'switchdev-next'

Scott Feldman says:

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switchdev: documentation updates

Update the switchdev documentation to clarify that for IPV4 FIB object, the add
op is used for both adding and modifying the FIB entry on the device.

I found a few other white-space and grammer issues to fix, and to clarify the
static FDB ops.
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Signed-off-by: David S. Miller <davem@davemloft.net>