Add missing `manufacturer` fields (#19065)

keyboards/cannonkeys/serenity/info.json

@@ -1,4 +1,5 @@
 {
+    "manufacturer": "Cannon Keys",
     "keyboard_name": "Serenity",
     "usb": {
         "vid": "0xCA04",

keyboards/handwired/dactyl_manuform/5x6_6/info.json

@@ -1,4 +1,5 @@
 {
+    "manufacturer": "QMK",
     "keyboard_name": "Dactyl Manuform 5x6+6",
     "url": "https://github.com/fgoodwin/dactyl-manuform-5x6_6/tree/main/5x6_6",
     "maintainer": "fgoodwin",

keyboards/handwired/dactyl_manuform/5x6_6/keymaps/default/keymap.c

@@ -32,7 +32,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
         KC_TRNS,   KC_TRNS,   KC_TRNS,   KC_TRNS,  KC_TRNS,       KC_TRNS,   KC_TRNS,     KC_TRNS,    KC_TRNS,     KC_TRNS,     KC_TRNS,    KC_F12,
         KC_TRNS,   KC_TRNS,   KC_PSCR,   KC_DOWN,  KC_UP,         KC_HOME,   KC_END,      KC_LEFT,    KC_RIGHT,    KC_TRNS,     KC_TRNS,    KC_TRNS,
         KC_TRNS,   KC_TRNS,   KC_TRNS,   KC_TRNS,  KC_TRNS,       KC_TRNS,   KC_TRNS,     KC_TRNS,    KC_TRNS,     KC_TRNS,     KC_BSLS,    KC_TRNS,
-                   RESET,     KC_TRNS,   KC_TRNS,  KC_TRNS,       KC_TRNS,   KC_TRNS,     KC_TRNS,    KC_TRNS,
+                   QK_BOOT,     KC_TRNS,   KC_TRNS,  KC_TRNS,       KC_TRNS,   KC_TRNS,     KC_TRNS,    KC_TRNS,
                                          MO(1),    LCTL(KC_C),    KC_TRNS,   MO(1),
                                          KC_TRNS,  LCTL(KC_V),    KC_TRNS,   KC_TRNS
     )