Renamed *.jet to *.kt in test data of JetPsiCheckerTest.

idea/testData/checker/Bounds2.kt

@@ -0,0 +1,13 @@
+fun test() {
+    foo<<error>Int?</error>>()
+    foo<Int>()
+    bar<Int?>()
+    bar<Int>()
+    bar<<error>Double?</error>>()
+    bar<<error>Double</error>>()
+    1.buzz<<error>Double</error>>()
+}
+
+fun foo<T : Any>() {}
+fun bar<T : Int?>() {}
+fun <T : <warning>Int</warning>> Int.buzz() : Unit {}