Document PWM pins and frequency for all boards

Previously, the reference page only contained documentation of PWM pins and the PWM frequency of those pins for a few boards. This commit adds documentation for all official Arduino boards.

The previous paragraph format did not scale well with the added information (which will continue to increase as Arduino creates new boards) so it was reformatted as a table.

Fixes #587

Author: animeshsrivastava24

Language/Functions/Analog IO/analogWrite.adoc

@@ -17,10 +17,25 @@ subCategories: [ "Analog I/O" ]
 
 [float]
 === Description
-Writes an analog value (http://arduino.cc/en/Tutorial/PWM[PWM wave]) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. After a call to `analogWrite()`, the pin will generate a steady square wave of the specified duty cycle until the next call to `analogWrite()` (or a call to `digitalRead()` or `digitalWrite()`) on the same pin. The frequency of the PWM signal on most pins is approximately 490 Hz. On the Uno and similar boards, pins 5 and 6 have a frequency of approximately 980 Hz.
+Writes an analog value (http://arduino.cc/en/Tutorial/PWM[PWM wave]) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. After a call to `analogWrite()`, the pin will generate a steady square wave of the specified duty cycle until the next call to `analogWrite()` (or a call to `digitalRead()` or `digitalWrite()`) on the same pin. 
+[options="header"]
+|====================================================================================================
+| Board                | PWM Pins                        | PWM Frequency
+| Uno, Nano, Mini      | 3, 5, 6, 9, 10, 11              | 490 Hz (pins 5 and 6: 980 Hz)
+| Mega                 | 2 - 13, 44 - 46                 | 490 Hz (pins 4 and 13: 980 Hz)
+| Leonardo, Micro, Yún | 3, 5, 6, 9, 10, 11, 13          | 490 Hz (pins 3 and 11: 980 Hz)
+| Uno WiFi Rev.2       | 3, 5, 6, 9, 10                  | 976 Hz
+| MKR boards *         | 0 - 8, 10, A3 (18), A4 (19)     | 732 Hz
+| MKR1000 WiFi *       | 0 - 8, 10, 11, A3 (18), A4 (19) | 732 Hz
+| Zero *               | 3 - 13, A0 (14), A1 (15)        | 732 Hz
+| Due **               | 2-13                            | 1000 Hz
+| 101                  | 3, 5, 6, 9                      | pins 3 and 9: 490 Hz, pins 5 and 6: 980 Hz
+|====================================================================================================
+{empty}* In addition to PWM capabilities on the pins noted above, the MKR and Zero boards have true analog output when using `analogWrite()` on the `DAC0` (`A0`) pin. +
+{empty}** In addition to PWM capabilities on the pins noted above, the Due has true analog output when using `analogWrite()` on pins `DAC0` and `DAC1`.
+
 [%hardbreaks]
-On most Arduino boards (those with the ATmega168 or ATmega328P), this function works on pins 3, 5, 6, 9, 10, and 11. On the Arduino Mega, it works on pins 2 - 13 and 44 - 46. Older Arduino boards with an ATmega8 only support `analogWrite()` on pins 9, 10, and 11.
-The Arduino DUE supports `analogWrite()` on pins 2 through 13, plus pins DAC0 and DAC1. Unlike the PWM pins, DAC0 and DAC1 are Digital to Analog converters, and act as true analog outputs.
+
 You do not need to call `pinMode()` to set the pin as an output before calling `analogWrite()`.
 The `analogWrite` function has nothing to do with the analog pins or the `analogRead` function.
 [%hardbreaks]