fix some C++ tests

tests/run/cpp_stl_conversion.pyx

@@ -31,7 +31,7 @@ def test_string(o):
 
 def test_string_call(a, b):
     """
-    >>> normalize(test_string_call("abc", "xyz"))
+    >>> normalize(test_string_call("abc".encode('ascii'), "xyz".encode('ascii')))
     'abcxyz'
     """
     return add_strings(a, b)

tests/run/fused_cpp.pyx

@@ -7,9 +7,9 @@ def test_cpp_specialization(cython.floating element):
     """
     >>> import cython
     >>> test_cpp_specialization[cython.float](10.0)
-    vector<float> * float 10.0
+    vector[float] * float 10.0
     >>> test_cpp_specialization[cython.double](10.0)
-    vector<double> * double 10.0
+    vector[double] * double 10.0
     """
     cdef vector[cython.floating] *v = new vector[cython.floating]()
     v.push_back(element)