change signature: preserve param javadoc when name was changed (IDEA-87521)

java/java-tests/testData/refactoring/changeSignature/ParamJavadoc1.java

@@ -0,0 +1,13 @@
+class X {
+
+    /**
+     * Has a method called {@link #mymethod(int)}.
+     */
+    public class TestRefactorLink {
+      /**
+       * @return nothing
+       * @param y yparam
+       */
+        public void <caret>mymethod(int y) { }
+    }
+}

java/java-tests/testData/refactoring/changeSignature/ParamJavadoc1_after.java

@@ -0,0 +1,13 @@
+class X {
+
+    /**
+     * Has a method called {@link #mymethod(boolean)}.
+     */
+    public class TestRefactorLink {
+      /**
+       * @return nothing
+       * @param z yparam
+       */
+        public void mymethod(boolean z) { }
+    }
+}

java/java-tests/testData/refactoring/introduceParameterObject/copyJavadoc/after/Test.java

@@ -1,7 +1,7 @@
 class Test {
   /**
    * foo comment
-   * @param param
+   * @param param long description
    */
   void foo(Param param) {
     bar(param.getS());