Documentation: networking: add missing PLCA messages from the message list

Physical Layer Collision Avoidance messages are correctly documented but
were left-out of the global list of ethnl messages, add them to the
list.
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://lore.kernel.org/r/20231130191400.817948-1-maxime.chevallier@bootlin.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/networking/ethtool-netlink.rst

@@ -223,6 +223,9 @@ Userspace to kernel:
   ``ETHTOOL_MSG_PSE_SET``               set PSE parameters
   ``ETHTOOL_MSG_PSE_GET``               get PSE parameters
   ``ETHTOOL_MSG_RSS_GET``               get RSS settings
+  ``ETHTOOL_MSG_PLCA_GET_CFG``          get PLCA RS parameters
+  ``ETHTOOL_MSG_PLCA_SET_CFG``          set PLCA RS parameters
+  ``ETHTOOL_MSG_PLCA_GET_STATUS``       get PLCA RS status
   ``ETHTOOL_MSG_MM_GET``                get MAC merge layer state
   ``ETHTOOL_MSG_MM_SET``                set MAC merge layer parameters
   ===================================== =================================
@@ -267,6 +270,9 @@ Kernel to userspace:
   ``ETHTOOL_MSG_MODULE_GET_REPLY``         transceiver module parameters
   ``ETHTOOL_MSG_PSE_GET_REPLY``            PSE parameters
   ``ETHTOOL_MSG_RSS_GET_REPLY``            RSS settings
+  ``ETHTOOL_MSG_PLCA_GET_CFG_REPLY``       PLCA RS parameters
+  ``ETHTOOL_MSG_PLCA_GET_STATUS_REPLY``    PLCA RS status
+  ``ETHTOOL_MSG_PLCA_NTF``                 PLCA RS parameters
   ``ETHTOOL_MSG_MM_GET_REPLY``             MAC merge layer status
   ======================================== =================================