fix tmy2 metadata label problem

Author: wholmgren

pvlib/tmy.py

@@ -292,13 +292,13 @@ def readtmy2(filename):
     =============    ==================================
     key              description
     =============    ==================================
-    SiteID           Site identifier code (WBAN number)
-    StationName      Station name
-    StationState     Station state 2 letter designator
-    SiteTimeZone     Hours from Greenwich
+    WBAN             Site identifier code (WBAN number)
+    City             Station name
+    State            Station state 2 letter designator
+    TZ               Hours from Greenwich
     latitude         Latitude in decimal degrees
     longitude        Longitude in decimal degrees
-    SiteElevation    Site elevation in meters
+    altitude         Site elevation in meters
     =============    ==================================
 
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