fix `%magic` output

call lsmagic without underscore

closes  #3467

IPython/core/magics/basic.py

@@ -271,7 +271,7 b" of any of them, type %magic_name?, e.g. '%cd?'."
 Currently the magic system has the following functions:""",
        magic_docs,
        "Summary of magic functions (from %slsmagic):" % magic_escapes['line'],
-       self._lsmagic(),
+       str(self.lsmagic()),
        ]
         page.page('\n'.join(out))