KT-3729 Quick documentation support

#KT-3729 Fixed

idea/testData/editor/quickDoc/OnFunctionDeclarationWithPackage.kt

@@ -0,0 +1,15 @@
+package test
+
+/**
+
+ *
+ *
+ * Test function
+
+ *
+ * @param first - Some
+ * @param second - Other
+ */
+fun <caret>testFun(first: String, second: Int) = 12
+
+// INFO: <b>internal</b> <b>fun</b> testFun(first: jet.String, second: jet.Int): jet.Int <i>defined in</i> test<br/><p>Test function<br/><br/><br/><b>@param</b> - <i>first</i> - Some<br/><b>@param</b> - <i>second</i> - Other<br/></p>