check valueOf signature before use synthetic javadoc (IDEA-81701)

java/java-tests/testData/codeInsight/javadocIG/enumValueOf.java

@@ -0,0 +1,12 @@
+enum En {
+  ;
+
+  /**
+   * myjavadoc
+   * @param i
+   * @return
+   */
+  static int valueOf(int i) {
+    return i;
+  }
+}