Moved files into separate folders per 'en' and 'zh_CN' language version and linked 'zh_CN' files back to 'en' files if translation is not yet available

docs/en/api-reference/ethernet/esp_eth.rst

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+ETHERNET
+========
+
+Application Example
+-------------------
+
+Ethernet example: :example:`ethernet/ethernet`.
+
+PHY Interfaces
+--------------
+
+The configured PHY model(s) are set in software by configuring the eth_config_t structure for the given PHY.
+
+Headers include a default configuration structure. These default configurations will need some members overriden or re-set before they can be used for a particular PHY hardware configuration. Consult the Ethernet example to see how this is done.
+
+  * :component_file:`ethernet/include/eth_phy/phy.h` (common)
+  * :component_file:`ethernet/include/eth_phy/phy_tlk110.h`
+  * :component_file:`ethernet/include/eth_phy/phy_lan8720.h`
+
+PHY Configuration Constants
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. doxygenvariable:: phy_tlk110_default_ethernet_config
+.. doxygenvariable:: phy_lan8720_default_ethernet_config
+
+
+API Reference - Ethernet
+------------------------
+
+.. include:: /_build/inc/esp_eth.inc
+
+API Reference - PHY Common
+--------------------------
+
+.. include:: /_build/inc/phy.inc
+
+API Reference - PHY TLK110
+--------------------------
+
+.. include:: /_build/inc/phy_tlk110.inc
+
+API Reference - PHY LAN8720
+---------------------------
+
+.. include:: /_build/inc/phy_lan8720.inc
+
+

docs/en/api-reference/ethernet/index.rst

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+Ethernet API
+************
+
+.. toctree::
+   :maxdepth: 1
+
+   Ethernet <esp_eth>
+
+
+Example code for this API section is provided in :example:`ethernet` directory of ESP-IDF examples.