dt-bindings: net: dsa: fix typo in dsa-tag-protocol description

There is a trivial typo when spelling "protocol", fix it.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/dsa/dsa.yaml

@@ -73,7 +73,7 @@ patternProperties:
           dsa-tag-protocol:
             description:
               Instead of the default, the switch will use this tag protocol if
-              possible. Useful when a device supports multiple protcols and
+              possible. Useful when a device supports multiple protocols and
               the default is incompatible with the Ethernet device.
             enum:
               - dsa