diff --git a/doc/source/index.rst.template b/doc/source/index.rst.template
index f18c61b5e2f95..b57ce83cfc33c 100644
--- a/doc/source/index.rst.template
+++ b/doc/source/index.rst.template
@@ -38,8 +38,7 @@ See the :ref:`overview` for more detail about what's in the library.
     :maxdepth: 3
     :hidden:
 {% endif %}
-
-    {% if not single_doc -%}
+{% if not single_doc %}
     What's New in 0.25.0 <whatsnew/v0.25.0>
     install
     getting_started/index
@@ -52,8 +51,7 @@ See the :ref:`overview` for more detail about what's in the library.
     {% if not single_doc -%}
     development/index
     whatsnew/index
-{% endif -%}
-
+{% endif %}
 
 * :doc:`whatsnew/v0.25.0`
 * :doc:`install`
diff --git a/doc/source/whatsnew/v0.17.1.rst b/doc/source/whatsnew/v0.17.1.rst
index c4dc442bd7354..9de49699b9652 100644
--- a/doc/source/whatsnew/v0.17.1.rst
+++ b/doc/source/whatsnew/v0.17.1.rst
@@ -61,7 +61,7 @@ We can render the HTML to get the following table.
    :file: whatsnew_0171_html_table.html
 
 :class:`~pandas.core.style.Styler` interacts nicely with the Jupyter Notebook.
-See the :ref:`documentation </style.ipynb>` for more.
+See the :ref:`documentation </user_guide/style.ipynb>` for more.
 
 .. _whatsnew_0171.enhancements:
 
diff --git a/doc/source/whatsnew/v0.20.0.rst b/doc/source/whatsnew/v0.20.0.rst
index 8e6ad07ec8435..51c8c488fb9d9 100644
--- a/doc/source/whatsnew/v0.20.0.rst
+++ b/doc/source/whatsnew/v0.20.0.rst
@@ -387,7 +387,7 @@ For example, after running the following, ``styled.xlsx`` renders as below:
    import os
    os.remove('styled.xlsx')
 
-See the :ref:`Style documentation </style.ipynb#Export-to-Excel>` for more detail.
+See the :ref:`Style documentation </user_guide/style.ipynb#Export-to-Excel>` for more detail.
 
 .. _whatsnew_0200.enhancements.intervalindex:
 
@@ -497,7 +497,7 @@ Other Enhancements
 - ``DataFrame.to_excel()`` has a new ``freeze_panes`` parameter to turn on Freeze Panes when exporting to Excel (:issue:`15160`)
 - ``pd.read_html()`` will parse multiple header rows, creating a MutliIndex header. (:issue:`13434`).
 - HTML table output skips ``colspan`` or ``rowspan`` attribute if equal to 1. (:issue:`15403`)
-- :class:`pandas.io.formats.style.Styler` template now has blocks for easier extension, see the :ref:`example notebook </style.ipynb#Subclassing>` (:issue:`15649`)
+- :class:`pandas.io.formats.style.Styler` template now has blocks for easier extension, see the :ref:`example notebook </user_guide/style.ipynb#Subclassing>` (:issue:`15649`)
 - :meth:`Styler.render() <pandas.io.formats.style.Styler.render>` now accepts ``**kwargs`` to allow user-defined variables in the template (:issue:`15649`)
 - Compatibility with Jupyter notebook 5.0; MultiIndex column labels are left-aligned and MultiIndex row-labels are top-aligned (:issue:`15379`)
 - ``TimedeltaIndex`` now has a custom date-tick formatter specifically designed for nanosecond level precision (:issue:`8711`)
diff --git a/doc/source/whatsnew/v0.25.0.rst b/doc/source/whatsnew/v0.25.0.rst
index 78d3d8fcb3d01..207d16afd350f 100644
--- a/doc/source/whatsnew/v0.25.0.rst
+++ b/doc/source/whatsnew/v0.25.0.rst
@@ -283,7 +283,7 @@ of ``object`` dtype. :attr:`Series.str` will now infer the dtype data *within* t
     s
     s.str.startswith(b'a')
 
-.. _whatsnew_0250.api_breaking.incompatible_index_unions
+.. _whatsnew_0250.api_breaking.incompatible_index_unions:
 
 Incompatible Index Type Unions
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/pandas/core/indexes/base.py b/pandas/core/indexes/base.py
index 5bf97f44edeed..9f0f89a0e34f5 100644
--- a/pandas/core/indexes/base.py
+++ b/pandas/core/indexes/base.py
@@ -1410,6 +1410,9 @@ def rename(self, name, inplace=False):
 
     @property
     def nlevels(self):
+        """
+        Number of levels.
+        """
         return 1
 
     def _sort_levels_monotonic(self):
@@ -1739,6 +1742,9 @@ def is_mixed(self):
         return self.inferred_type in ['mixed']
 
     def holds_integer(self):
+        """
+        Whether the type is an integer type.
+        """
         return self.inferred_type in ['integer', 'mixed-integer']
 
     @cache_readonly
@@ -3965,6 +3971,9 @@ def _is_memory_usage_qualified(self):
         return self.is_object()
 
     def is_type_compatible(self, kind):
+        """
+        Whether the index type is compatible with the provided type.
+        """
         return kind == self.inferred_type
 
     _index_shared_docs['contains'] = """
@@ -4337,6 +4346,9 @@ def sort_values(self, return_indexer=False, ascending=True):
             return sorted_index
 
     def sort(self, *args, **kwargs):
+        """
+        Use sort_values instead.
+        """
         raise TypeError("cannot sort an Index object in-place, use "
                         "sort_values instead")