Minor: JetFile -> KtFile

compiler/frontend/src/org/jetbrains/kotlin/psi/KtFile.java

@@ -70,7 +70,7 @@ public class KtFile extends PsiFileBase implements KtDeclarationContainer, KtAnn
 
     @Override
     public String toString() {
-        return "JetFile: " + getName();
+        return "KtFile: " + getName();
     }
 
     @NotNull

compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/data/KtClassOrObjectInfo.java

@@ -81,7 +81,7 @@ public abstract class KtClassOrObjectInfo<E extends KtClassOrObject> implements
             KtFile jetFile = (KtFile) file;
             return jetFile.getPackageFqName();
         }
-        throw new IllegalArgumentException("Not in a JetFile: " + element);
+        throw new IllegalArgumentException("Not in a KtFile: " + element);
     }
 
     @NotNull