[trivial] adding a comment to give context to the fix for delombok being overly liberal with applying "var" to things.

src/utils/lombok/javac/JavacTreeMaker.java

@@ -442,6 +442,8 @@ public class JavacTreeMaker {
 	private static final MethodId<JCVariableDecl> VarDef = MethodId("VarDef");
 	public JCVariableDecl VarDef(JCModifiers mods, Name name, JCExpression vartype, JCExpression init) {
 		JCVariableDecl varDef = invoke(VarDef, mods, name, vartype, init);
+		// We use 'position of the type is -1' as indicator in delombok that the original node was written using JDK10's 'var' feature, because javac desugars 'var' to the real type and doesn't leave any markers other than the
+		// node position to indicate that it did so. Unfortunately, that means vardecls we generate look like 'var' to delombok. Adjust the position to avoid this.
 		if (varDef.vartype != null && varDef.vartype.pos == -1) varDef.vartype.pos = 0;
 		return varDef;
 	}