esp_wifi: re-enable build wifi example

examples/wifi/espnow/README.md

@@ -1,6 +1,3 @@
-| Supported Targets | ESP32 |
-| ----------------- | ----- |
-
 # ESPNOW Example
 
 (See the README.md file in the upper level 'examples' directory for more information about examples.)

examples/wifi/iperf/README.md

@@ -1,6 +1,3 @@
-| Supported Targets | ESP32 |
-| ----------------- | ----- |
-
 # Iperf Example
 
 ## Note about iperf version

examples/wifi/simple_sniffer/README.md

@@ -1,6 +1,3 @@
-| Supported Targets | ESP32 |
-| ----------------- | ----- |
-
 # Simple Sniffer Example
 
 (See the README.md file in the upper level 'examples' directory for more information about examples.)