fix doc typo

docs/src/userguide/wrapping_CPlusPlus.rst

@@ -435,7 +435,7 @@ arguments) or by an explicit cast, e.g.::
     print(vect)              # [1, 3, 5, 7, 9]
 
     cdef vector[string] cpp_strings = b'ab cd ef gh'.split()
-    print(cpp_strings.get(1))   # b'cd'
+    print(cpp_strings[1])   # b'cd'
 
 The following coercions are available: