Update README.md

Author: realA10001986

README.md

@@ -824,7 +824,7 @@ The connector for "Door 2" can, instead of for a door switch, also be used as an
 Please do not power any peripheral through this pin; instead, use a relay, and connect "C"(=GND) and "D2" as relay triggers. In case of a standard "Aruino relay module", connect "C" to GND, "D2" to "S"(or "IN"), and 5V as well as GND to a 5V power supply.
 
 <details>
-<summary>For experts...</summary>
+<summary>Advanced...</summary>
 
 You can grab the +5V also from the Control Board, if you connect all three joints of the "Light Power" solder jumper; +5V will then be on the left pin of the "Ext. Light Pwr" connector; of course, this connector cannot be used for external light power after this modification.