Merge branch 'bugfix/example_index' into 'master'

fix example index

Fix duplicate index 14 example and the index in some rst files.

See merge request !270

docs/api/esp_eth.rst

@@ -4,7 +4,7 @@ ETHERNET
 Application Example
 -------------------
 
-ethernet example: `examples/14_ethernet <https://github.com/espressif/esp-idf/tree/master/examples/14_ethernet>`_.
+ethernet example: `examples/17_ethernet <https://github.com/espressif/esp-idf/tree/master/examples/17_ethernet>`_.
 
 API Reference
 -------------

docs/api/pcnt.rst

@@ -9,7 +9,7 @@ The PCNT (Pulse Counter) module is designed to count the number of rising and/or
 Application Example
 -------------------
 
-Pulse counter with control signal and event interrupt example: `examples/12_pcnt <https://github.com/espressif/esp-idf/tree/master/examples/12_pcnt>`_.
+Pulse counter with control signal and event interrupt example: `examples/16_pcnt <https://github.com/espressif/esp-idf/tree/master/examples/16_pcnt>`_.
 
 API Reference
 -------------