Fixed generation of type in docstring in case of it already presents as @param (PY-8930).

python/testData/intentions/afterTypeInDocstring7.py

@@ -0,0 +1,7 @@
+def foo(bar, baz):
+    """Do foo.
+    :type bar: object<caret>
+    :param bar: something
+    :return: something else
+    """
+    return bar + baz

python/testData/intentions/beforeTypeInDocstring7.py

@@ -0,0 +1,6 @@
+def foo(b<caret>ar, baz):
+    """Do foo.
+    :param bar: something
+    :return: something else
+    """
+    return bar + baz