Rename unary plus() and minus() to unaryPlus() and unaryMinus()

idea/testData/quickfix/createFromUsage/createFunction/binaryOperations/plusExtraArgs.kt

@@ -1,9 +1,9 @@
 // "Create member function 'plus'" "true"
 
 class A<T>(val n: T) {
-    fun plus(): A<T> = throw Exception()
+    operator fun unaryPlus(): A<T> = throw Exception()
 }
 
 fun test() {
-    val a: A<Int> = A(1) + <caret>2
+    val a: A<Int> = A(1) +<caret> 2
 }