Fix missing documentation for many clock faces:

* Move from .c to .h as needed for consistency.
* When missing from both, copy from pull request or wiki.
* When missing entirely, infer functionality from source code.

movement/watch_faces/complication/day_one_face.h

@@ -25,10 +25,29 @@
 #ifndef DAY_ONE_FACE_H_
 #define DAY_ONE_FACE_H_
 
-#include "movement.h"
+/*
+ * DAY ONE face
+ *
+ * This watch face displays the number of days since a given date.
+ * It was originally designed to display the number of days you’ve been alive,
+ * but technically it can count up from any date in the 20th century or the
+ * 21st century, so far.
+ *
+ * Long press on the Alarm button to enter customization mode. The text “YR”
+ * will appear, and will allow you to set the year starting from 1959. Press
+ * Alarm repeatedly to advance the year. If your birthday is before 1959,
+ * advance beyond the current year and it will wrap around to 1900.
+ *
+ * Once you have set the year, press Light to set the month (“MO”) and
+ * day (“DA”), advancing the value by pressing Alarm repeatedly.
+ *
+ * Note that at this time, the Day One face does not display the sleep
+ * indicator in sleep mode, which may make the watch appear to be
+ * unresponsive in sleep mode. You can still press the Alarm button to
+ * wake the watch. This UI quirk will be addressed in a future update.
+ */
 
-// The Day One face is designed to count upwards from the wearer's date of birth. It also functions as an
-// interface for setting the birth date register, which other watch faces can use for various purposes.
+#include "movement.h"
 
 typedef struct {
     uint8_t current_page;