Clean up StructUsing's description (#7806)

Author: sovdeeth

src/main/java/ch/njol/skript/structures/StructUsing.java

@@ -17,7 +17,8 @@
 @Name("Using Experimental Feature")
 @Description({
 	"Place at the top of a script file to enable an optional experimental feature.",
-	"For example, this might include "
+	"Experimental features may change behavior in Skript and may contain bugs. Use at your own discretion.",
+	"A list of the available experimental features can be found in the changelog for your version of Skript."
 })
 @Examples({
 	"using 1.21",
@@ -32,7 +33,6 @@ public class StructUsing extends Structure {
 		Skript.registerSimpleStructure(StructUsing.class, "using [[the] experiment] <.+>");
 	}
 
-	@SuppressWarnings("NotNullFieldNotInitialized")
 	private Experiment experiment;
 
 	@Override