add 0 = Sunday to day format

Signed-off-by: Kerry Archibald <kerrya@element.io>

proposals/3767-time-based-notification-filtering.md

@@ -24,7 +24,7 @@ to filter based on time of day and day of week.
 | key | type | value | description | Required |
 | ---- | ----| ----- | ----------- | -------- |
 | `time_of_day` | string[] | tuple of `hh:mm` time | Tuple representing start and end of a time interval in which the rule should match. Times are [ISO 8601 formatted times](https://en.wikipedia.org/wiki/ISO_8601#:~:text=As%20of%20ISO%208601%2D1,minute%20between%2000%20and%2059.). Times are inclusive | Optional. When omitted all times are matched.  |
-| `day_of_week` | number[] | array of integers 1-7 | An array of integers representing days of the week on which the rule should match, where 1 = Monday, 7 = Sunday | **Required** |
+| `day_of_week` | number[] | array of integers 0-7 | An array of integers representing days of the week on which the rule should match, where 0 = Sunday, 1 = Monday, 7 = Sunday | **Required** |
 
 
 - `time_of_day` condition is met when the server's timezone-adjusted time is between the values of the tuple, or when no