fix typo

Author: Uwe Krien

pvlib/modelchain.py

@@ -323,7 +323,7 @@ def __init__(self, system, location,
 
     def __repr__(self):
         return ('ModelChain for: ' + str(self.system) +
-                ' orientation_startegy: ' + str(self.orientation_strategy) +
+                ' orientation_strategy: ' + str(self.orientation_strategy) +
                 ' clearsky_model: ' + str(self.clearsky_model) +
                 ' transposition_model: ' + str(self.transposition_model) +
                 ' solar_position_method: ' + str(self.solar_position_method) +

pvlib/test/test_modelchain.py

@@ -412,7 +412,7 @@ def test_ModelChain___repr__(system, location):
 
     assert mc.__repr__() == ('ModelChain for: PVSystem with tilt:32.2 and '+
     'azimuth: 180 with Module: None and Inverter: None '+
-    'orientation_startegy: south_at_latitude_tilt clearsky_model: '+
+    'orientation_strategy: south_at_latitude_tilt clearsky_model: '+
     'ineichen transposition_model: haydavies solar_position_method: '+
     'nrel_numpy airmass_model: kastenyoung1989')