Corrected a wrong numpy record name in documentation. adjusted_close in parse_yahoo_historical doesn't exist, the author mean aclose

Author: Lodato Luciano

lib/matplotlib/finance.py

@@ -72,7 +72,7 @@ def parse_yahoo_historical(fh, adjusted=True, asobject=False):
       Otherwise return a numpy recarray with
 
         date, year, month, day, d, open, close, high, low,
-        volume, adjusted_close
+        volume, aclose
 
       where d is a floating poing representation of date,
       as returned by date2num, and date is a python standard