Clarify documentation for `Feature`'s `EnableMe()`

sources/BaseRealm/AcediaEnvironment/AcediaEnvironment.uc

@@ -414,6 +414,7 @@ public final function Feature GetEnabledFeature(class<Feature> featureClass)
 
 /**
  *  Enables given `Feature` instance `newEnabledFeature` with a given config.
+ *  Does not change a config for already enabled feature, failing instead.
  *
  *  @see `Feature::EnableMe()`.
  *