DOC: minor updates in faq

Author: jreback

doc/source/faq.rst

@@ -28,7 +28,7 @@ Frequently Asked Questions (FAQ)
 .. _df-memory-usage:
 
 DataFrame memory usage
-~~~~~~~~~~~~~~~~~~~~~~
+----------------------
 As of pandas version 0.15.0, the memory usage of a dataframe (including
 the index) is shown when accessing the ``info`` method of a dataframe. A
 configuration option, ``display.memory_usage`` (see :ref:`options`),

doc/source/gotchas.rst

@@ -343,12 +343,12 @@ Reindex potentially changes underlying Series dtype
 
 The use of ``reindex_like`` can potentially change the dtype of a ``Series``.
 
-.. code-block:: python
+.. ipython:: python
 
-   series = pandas.Series([1, 2, 3])
-   x = pandas.Series([True])
+   series = Series([1, 2, 3])
+   x = Series([True])
    x.dtype
-   x = pandas.Series([True]).reindex_like(series)
+   x = Series([True]).reindex_like(series)
    x.dtype
 
 This is because ``reindex_like`` silently inserts ``NaNs`` and the ``dtype``