DOC: Small doc fixups of missing pd. and numpy method (pandas-dev#24659)

Author: jorisvandenbossche

doc/source/basics.rst

@@ -76,7 +76,7 @@ The exact details of what an :class:`~pandas.api.extensions.ExtensionArray` is a
 beyond the scope of this introduction. See :ref:`basics.dtypes` for more.
 
 If you know you need a NumPy array, use :meth:`~Series.to_numpy`
-or :meth:`numpy.ndarray.asarray`.
+or :meth:`numpy.asarray`.
 
 .. ipython:: python
 

doc/source/whatsnew/v0.17.0.rst

@@ -984,9 +984,9 @@ Removal of prior version deprecations/changes
   .. ipython:: python
 
      np.random.seed(1234)
-     df = DataFrame(np.random.randn(5, 2),
-                    columns=list('AB'),
-                    index=date_range('20130101', periods=5))
+     df = pd.DataFrame(np.random.randn(5, 2),
+                       columns=list('AB'),
+                       index=pd.date_range('2013-01-01', periods=5))
      df
 
   Previously