added empty line to comment generation

python/src/com/jetbrains/python/documentation/PythonDocumentationProvider.java

@@ -818,7 +818,7 @@ public class PythonDocumentationProvider extends AbstractDocumentationProvider i
 
   private String generateContent(PyFunction element, String offset, String prefix) {
     PyParameter[] list = element.getParameterList().getParameters();
-    StringBuilder builder = new StringBuilder();
+    StringBuilder builder = new StringBuilder(offset);
     for(PyParameter p : list) {
       builder.append(prefix);
       builder.append("param ");

python/testData/codeInsight/smartEnter/docEpytext_after.py

@@ -1,6 +1,7 @@
 
 def foo(a, b):
   """
+  <caret>
   @param a:
   @param b:
   @return:

python/testData/codeInsight/smartEnter/docRest_after.py

@@ -1,6 +1,7 @@
 
 def foo(a, b):
   """
+  <caret>
   :param a:
   :param b:
   :return: