docs: Alphbetically sort toctree

This commit sorts the entries of variuos toctrees
alphabetically. Indentation was also fixed. The order
of some toctrees were not modified if the existing
order had some form of suggested reading order.

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

@@ -4,26 +4,26 @@ Peripherals API
 :link_to_translation:`zh_CN:[中文]`
 
 .. toctree::
-   :maxdepth: 1
+    :maxdepth: 1
 
-   ADC <adc>
-   CAN <can>
-   DAC <dac>
-   GPIO (including RTC low power I/O) <gpio>
-   I2C <i2c>
-   I2S <i2s>
-   LED Control <ledc>
-   MCPWM <mcpwm>
-   Pulse Counter <pcnt>
-   Remote Control <rmt>
-   SDMMC Host <sdmmc_host>
-   SD SPI Host <sdspi_host>
-   SDIO Slave <sdio_slave>
-   Sigma-delta Modulation <sigmadelta>
-   SPI Master <spi_master>
-   SPI Slave <spi_slave>
-   Timer <timer>
-   Touch Sensor <touch_pad>
-   UART <uart>
+    ADC <adc>
+    CAN <can>
+    DAC <dac>
+    GPIO (including RTC low power I/O) <gpio>
+    I2C <i2c>
+    I2S <i2s>
+    LED Control <ledc>
+    MCPWM <mcpwm>
+    Pulse Counter <pcnt>
+    Remote Control <rmt>
+    SD SPI Host <sdspi_host>
+    SDIO Slave <sdio_slave>
+    SDMMC Host <sdmmc_host>
+    Sigma-delta Modulation <sigmadelta>
+    SPI Master <spi_master>
+    SPI Slave <spi_slave>
+    Timer <timer>
+    Touch Sensor <touch_pad>
+    UART <uart>
 
 Code examples for this API section are provided in the :example:`peripherals` directory of ESP-IDF examples.