resolve references from @param to type parameters of functions

#KT-12001 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/kdoc/KDocReference.kt

@@ -102,7 +102,7 @@ fun getParamDescriptors(fromDescriptor: DeclarationDescriptor): List<Declaration
     // TODO resolve parameters of functions passed as parameters
     when (fromDescriptor) {
         is CallableDescriptor ->
-            return fromDescriptor.valueParameters
+            return fromDescriptor.valueParameters + fromDescriptor.typeParameters
         is ClassifierDescriptor -> {
             val typeParams = fromDescriptor.typeConstructor.parameters
             if (fromDescriptor is ClassDescriptor) {

idea/testData/editor/quickDoc/OnMethodUsageWithTypeParameter.kt

@@ -0,0 +1,17 @@
+/**
+Some documentation
+
+ * @param T the type parameter
+ * @param a Some int
+ * @param b String
+ */
+fun <T> testMethod(a: Int, b: String) {
+
+}
+
+fun test() {
+    <caret>testMethod(1, "value")
+}
+
+//INFO: <b>public</b> <b>fun</b> &lt;T&gt; testMethod(a: Int, b: String): Unit <i>defined in</i> root package<p>Some documentation</p>
+//INFO: <dl><dt><b>Parameters:</b></dt><dd><code>T</code> - the type parameter</dd><dd><code>a</code> - Some int</dd><dd><code>b</code> - String</dd></dl>

idea/testData/kdoc/rename/TypeParamReference.kt

@@ -0,0 +1,4 @@
+/**
+ * @param T this is a type parameter
+ */
+fun <<caret>T> f(s: String) { }

idea/testData/kdoc/rename/TypeParamReference.kt.after

@@ -0,0 +1,4 @@
+/**
+ * @param R this is a type parameter
+ */
+fun <<caret>R> f(s: String) { }

idea/tests/org/jetbrains/kotlin/idea/editor/quickDoc/QuickDocProviderTestGenerated.java

@@ -155,6 +155,12 @@ public class QuickDocProviderTestGenerated extends AbstractQuickDocProviderTest
         doTest(fileName);
     }
 
+    @TestMetadata("OnMethodUsageWithTypeParameter.kt")
+    public void testOnMethodUsageWithTypeParameter() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/testData/editor/quickDoc/OnMethodUsageWithTypeParameter.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("TopLevelMethodFromJava.java")
     public void testTopLevelMethodFromJava() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/testData/editor/quickDoc/TopLevelMethodFromJava.java");

idea/tests/org/jetbrains/kotlin/idea/kdoc/KdocRenameTest.java

@@ -36,6 +36,10 @@ public class KdocRenameTest extends LightCodeInsightTestCase {
         doTest("bar");
     }
 
+    public void testTypeParamReference() throws Exception {
+        doTest("R");
+    }
+
     public void testCodeReference() throws Exception {
         doTest("xyzzy");
     }