DOC: suppress warning in docs

Author: y-p

doc/source/dsintro.rst

@@ -490,12 +490,7 @@ objects), and the DataFrame index also contains dates, the broadcasting will be
 column-wise:
 
 .. ipython:: python
-   :suppress:
-
-   import warnings
-   warnings.filterwarnings("ignore",message='TimeSeries broadcasting',category=FutureWarning)
-
-.. ipython:: python
+   :okwarning:
 
    index = date_range('1/1/2000', periods=8)
    df = DataFrame(randn(8, 3), index=index, columns=list('ABC'))

doc/source/v0.10.1.txt

@@ -68,11 +68,8 @@ Retrieving unique values in an indexable or data column.
 .. ipython:: python
    :okwarning:
 
-   import warnings
-   with warnings.catch_warnings():
-       warnings.simplefilter('ignore', category=UserWarning)
-       store.unique('df','index')
-       store.unique('df','string')
+   store.unique('df','index')
+   store.unique('df','string')
 
 You can now store ``datetime64`` in data columns