touch_sensor: update readme for all examples

examples/peripherals/touch_sensor/touch_element/touch_button/README.md

@@ -3,18 +3,28 @@
 
 # Touch button example
 
+(See the README.md file in the upper level 'examples' directory for more information about examples.)
+
 This example demonstrates how to use the Touch Element library of capacitive touch sensor and set up touch button.
 
 ## How to use example
 
+### Hardware Required
+
+* A development board with ESP32-S2 or ESP32-S3 chip
+* A touch extension board like [esp32-s2-touch-devkit-1](https://docs.espressif.com/projects/espressif-esp-dev-kits/en/latest/esp32s2/esp32-s2-touch-devkit-1/user_guide.html)
+
 ### Configure the project
 
-* Set the target of the build (where `{IDF_TARGET}` stands for the target chip such as `esp32s2`).
-* Run `menuconfig` to select a dispatch method for the example.
+* Set the target of the build by following command, where TARGET can be `esp32s2` or `esp32s3`.
+```
+idf.py set-target TARGET
+```
+* Run `idf.py menuconfig` to select a dispatch method for the example.
 
 ### Build and Flash
 
-Build the project and flash it to the target board, then run monitor tool to view serial output:
+Build the project and flash it to the board, then run monitor tool to view serial output:
 
 ```
 idf.py -p PORT flash monitor
@@ -56,4 +66,6 @@ I (11991) Touch Button Example: Button[9] LongPress
 I (12881) Touch Button Example: Button[9] Release
 ```
 
-See the README.md file in the upper level 'examples' directory for more information about examples.
+## Troubleshooting
+
+For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.