fix #335 : Standardize nan to NaN in all docstrings. Keep nan when printing values. (same as Numpy).

Author: alixdamman

larray/core/array.py

@@ -1112,7 +1112,7 @@ def to_series(self, name=None, dropna=False):
             b2    5.0
         Name: my_name, dtype: float64
 
-        Drop nan values
+        Drop NaN values
 
         >>> arr['b1'] = nan
         >>> arr

larray/core/ufuncs.py

@@ -150,7 +150,7 @@ def wrapper(*args, **kwargs):
     Notes
     -----
     The maximum is equivalent to ``where(x1 >= x2, x1, x2)`` when
-    neither x1 nor x2 are nans, but it is faster.
+    neither x1 nor x2 are NaNs, but it is faster.
 
     Examples
     --------