Remove NONE from mode enum and doc tweaks

Author: tannewt

shared-bindings/watchdog/WatchDogMode.c

@@ -74,14 +74,13 @@ mp_obj_t watchdog_watchdogmode_type_to_obj(watchdog_watchdogmode_t mode) {
 }
 
 STATIC const mp_rom_map_elem_t watchdog_watchdogmode_locals_dict_table[] = {
-    {MP_ROM_QSTR(MP_QSTR_NONE),   MP_ROM_PTR(&mp_const_none_obj)},
     {MP_ROM_QSTR(MP_QSTR_RAISE),  MP_ROM_PTR(&watchdog_watchdogmode_raise_obj)},
     {MP_ROM_QSTR(MP_QSTR_RESET),  MP_ROM_PTR(&watchdog_watchdogmode_reset_obj)},
 };
 STATIC MP_DEFINE_CONST_DICT(watchdog_watchdogmode_locals_dict, watchdog_watchdogmode_locals_dict_table);
 
 STATIC void watchdog_watchdogmode_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
-    qstr runmode = MP_QSTR_NONE;
+    qstr runmode = MP_QSTR_None;
     if (MP_OBJ_TO_PTR(self_in) == MP_ROM_PTR(&watchdog_watchdogmode_raise_obj)) {
         runmode = MP_QSTR_RAISE;
     }

shared-bindings/watchdog/WatchDogTimer.c

@@ -40,6 +40,20 @@
 
 #include "supervisor/port.h"
 
+//| class WatchDogTimer:
+//|     """Timer that is used to detect code lock ups and automatically reset the microcontroller
+//|        when one is detected.
+//|
+//|        A lock up is detected when the watchdog hasn't been fed after a given duration. So, make
+//|        sure to call `feed` within the timeout.
+//|     """
+//|
+
+//|     def __init__(self, ):
+//|         """Not currently dynamically supported. Access the sole instance through `microcontroller.watchdog`."""
+//|         ...
+//|
+
 //|     def feed(self):
 //|         """Feed the watchdog timer. This must be called regularly, otherwise
 //|         the timer will expire."""

shared-bindings/watchdog/__init__.c

@@ -34,18 +34,14 @@
 //|
 //| The `watchdog` module provides support for a Watchdog Timer. This timer will reset the device
 //| if it hasn't been fed after a specified amount of time. This is useful to ensure the board
-//| has not crashed or locked up. You can enable the watchdog timer using :class:`wdt.WDT`.
-//| Note that on some platforms the watchdog timer cannot be disabled once it has been enabled.
+//| has not crashed or locked up. Note that on some platforms the watchdog timer cannot be disabled
+//| once it has been enabled.
 //|
-//| The WatchDogTimer is used to restart the system when the application crashes and ends
+//| The `WatchDogTimer` is used to restart the system when the application crashes and ends
 //| up into a non recoverable state. Once started it cannot be stopped or
 //| reconfigured in any way. After enabling, the application must "feed" the
 //| watchdog periodically to prevent it from expiring and resetting the system.
 //|
-//| Note that this module can't be imported and used directly. The sole
-//| instance of :class:`WatchDogTimer` is available at
-//| :attr:`microcontroller.watchdog`.
-//|
 //| Example usage::
 //|
 //|     from microcontroller import watchdog as w