Remove legacy keycodes, part 2 (#18660)

* `KC_SYSREQ` -> `KC_SYRQ`

And one `KC_ALT_ERASE` -> `KC_ERAS`

* `KC_NONUS_BSLASH` -> `KC_NUBS`

* `KC_NUMLOCK` -> `KC_NUM`

* `KC_CLCK` -> `KC_CAPS`

* `KC_SCROLLLOCK` -> `KC_SCRL`

* `KC_LBRACKET` -> `KC_LBRC`

* `KC_RBRACKET` -> `KC_RBRC`

* `KC_CAPSLOCK` -> `KC_CAPS`

keyboards/rocketboard_16/keycode_lookup.c

@@ -206,7 +206,7 @@ lookup_table_t lookup_table[333] =
  {"KC_LNG8", KC_LNG8},
  {"KC_LNG9", KC_LNG9},
  {"KC_ERAS", KC_ERAS},
- {"KC_SYSREQ", KC_SYSREQ},
+ {"KC_SYRQ", KC_SYRQ},
  {"KC_CANCEL", KC_CANCEL},
  {"KC_CLR", KC_CLR},
  {"KC_CLEAR", KC_CLEAR},