adc: change the way data is formattted in adc_dma_demo

The way the adc_dma_demo data was formatted caused it go get parsed as markdown syntax.

Changed it be more "human" readable as well as put all ADC examples in a common folder

docs/en/api-reference/peripherals/adc.rst

@@ -76,7 +76,7 @@ Reading voltage on ADC1 channel 0 ({IDF_TARGET_ADC1_CH0})::
         int val = adc1_get_raw(ADC1_CHANNEL_0);
 
 The input voltage in the above example is from 0 to 1.1 V (0 dB attenuation). The input range can be extended by setting a higher attenuation, see :cpp:type:`adc_atten_t`.
-An example of using the ADC driver including calibration (discussed below) is available at esp-idf: :example:`peripherals/adc`
+An example of using the ADC driver including calibration (discussed below) is available at esp-idf: :example:`peripherals/adc/adc`
 
 Reading voltage on ADC2 channel 7 ({IDF_TARGET_ADC2_CH7})::
 
@@ -95,7 +95,7 @@ Reading voltage on ADC2 channel 7 ({IDF_TARGET_ADC2_CH7})::
         }
 
 The reading may fail due to collision with Wi-Fi, should check it.
-An example using the ADC2 driver to read the output of DAC is available in esp-idf: :example:`peripherals/adc2`
+An example using the ADC2 driver to read the output of DAC is available in esp-idf: :example:`peripherals/adc/adc2`
 
 .. only:: esp32
 

examples/peripherals/adc_dma_demo/README.md

@@ -1,55 +0,0 @@
-| Supported Targets | ESP32-C3 |
-| ----------------- | -------- |
-
-# ADC DMA Example
-
-(See the README.md file in the upper level 'examples' directory for more information about examples.)
-
-This example shows how to use DMA to read voltage from a GPIO pin via ADC controller.
-
-## How to use example
-
-### Hardware Required
-
-* A development board with ESP32C3 SoC
-* A USB cable for power supply and programming
-
-In this example, we use `ADC_UNIT_1` by default, we need to connect a voltage source (0 ~ 3.3v) to GPIO1. If another ADC unit is selected in your application, you need to change the GPIO pin (please refer to the `ESP32C3 Technical Reference Manual`).
-
-### Configure the project
-
-```
-idf.py menuconfig
-```
-
-### Build and Flash
-
-Build the project and flash it to the board, then run monitor tool to view serial output:
-
-```
-idf.py -p PORT flash monitor
-```
-
-(To exit the serial monitor, type ``Ctrl-]``.)
-
-See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
-
-## Example Output
-
-Running this example, you will see the following log output on the serial monitor:
-
-[unit_channel_data](<all the data you read from the ADC>)
-```
-[0_1_54e](4e 25 00 00)
-[0_1_548](48 25 00 00)
-[0_1_556](56 25 00 00)
-```
-
-## Troubleshooting
-
-* program upload failure
-
-    * Hardware connection is not correct: run `idf.py -p PORT monitor`, and reboot your board to see if there are any output logs.
-    * The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
-
-For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.