Update chargers.mdx (#763)

Author: guineapirates

docs/devices/chargers.mdx

@@ -4031,7 +4031,7 @@ Optional zusätzlich ein oder mehrere aus
 
 ```yaml
     ...
-    maxcurrentmilis: # set charger max current (mA), maxcurrent: MUST be defined too!
+    maxcurrentmillis: # set charger max current (mA), maxcurrent: MUST be defined too!
       source: ...
       # ...
     Phases1p3p: # phase switching (1/3)