Spelling/typos fixes

IPython/nbformat/convert.py

@@ -65,7 +65,7 b' def convert(nb, to_version):'
             raise Exception("Cannot convert notebook from v%d to v%d.  Operation" \
                 "failed silently." % (major, step_version))
 
-        # Recuresively convert until target version is reached.
+        # Recursively convert until target version is reached.
         return convert(converted, to_version)
     else:
         raise Exception("Cannot convert notebook to v%d because that " \

IPython/nbformat/tests/test_convert.py

@@ -51,8 +51,8 b' class TestConvert(TestsBase):'
 
 
     def test_open_current(self):
-        """Can an old notebook be opened and converted to the current verion while
-        remembering the original version of the notebook?"""
+        """Can an old notebook be opened and converted to the current version 
+        while remembering the original version of the notebook?"""
 
         # Open a version 2 notebook and attempt to upgrade it to the current version
         # while remembering it's version information.