typo fix -- thanks @peastman

wrappers/python/simtk/openmm/app/checkpointreporter.py

@@ -37,11 +37,11 @@ __all__ = ['CheckpointReporter']
 
 class CheckpointReporter(object):
     """CheckpointReporter saves periodic checkpoints of a simulation.
-    The checkpoints will overwrite one and other -- only the last checkpoint
+    The checkpoints will overwrite one another -- only the last checkpoint
     will be saved in the file.
 
     To use it, create a CheckpointReporter, then add it to the Simulation's
-    list of reporters. To load a checkpoint file a continue a simulation,
+    list of reporters. To load a checkpoint file and continue a simulation,
     use the following recipe:
 
     >>> with open('checkput.chk', 'rb') as f:

wrappers/python/tests/TestCheckpointReporter.py

@@ -20,7 +20,10 @@ class TestCheckpointReporter(unittest.TestCase):
         self.simulation.reporters.append(app.CheckpointReporter(file, 1))
         self.simulation.step(1)
         
+        with open(file.name, 'rb') as f:
+            self.simulation.context.loadCheckpoint(f.read())
 
+        file.close()
 
 if __name__ == '__main__':
-    unittest.main()
+    unittest.main()
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