Fix links

Author: phofl

doc/source/user_guide/copy_on_write.rst

@@ -6,6 +6,12 @@
 Copy-on-Write (CoW)
 *******************
 
+.. note::
+
+    Copy-on-Write will become the default in pandas 3.0 We recommend
+    :ref:`turning it on now <copy_on_write_enabling>`
+    to benefit from all improvements.
+
 Copy-on-Write was first introduced in version 1.5.0. Starting from version 2.0 most of the
 optimizations that become possible through CoW are implemented and supported. All possible
 optimizations are supported starting from pandas 2.1.
@@ -123,6 +129,8 @@ CoW triggers a copy when ``df`` is changed to avoid mutating ``view`` as well:
     df
     view
 
+.. _copy_on_write_chained_assignment:
+
 Chained Assignment
 ------------------
 
@@ -238,6 +246,8 @@ and :meth:`DataFrame.rename`.
 These methods return views when Copy-on-Write is enabled, which provides a significant
 performance improvement compared to the regular execution.
 
+.. _copy_on_write_enabling:
+
 How to enable CoW
 -----------------
 

doc/source/user_guide/indexing.rst

@@ -1729,12 +1729,11 @@ Returning a view versus a copy
 
 .. warning::
 
-    `Copy-on-Write
-         <https://pandas.pydata.org/docs/dev/user_guide/copy_on_write.html>`__.
+    :ref:`Copy-on-Write <copy_on_write>`
     will become the new default in pandas 3.0. This means than chained indexing will
     never work. As a consequence, the ``SettingWithCopyWarning`` won't be necessary
     anymore.
-    See `this section <https://mathdatasimplified.com/2023/04/20/copy-on-write-mode-in-pandas-2-0/>`__
+    See :ref:`this section <copy_on_write_chained_assignment>`
     for more context.
     We recommend turning Copy-on-Write on to leverage the improvements with
 
@@ -1784,12 +1783,11 @@ Why does assignment fail when using chained indexing?
 
 .. warning::
 
-    `Copy-on-Write
-         <https://pandas.pydata.org/docs/dev/user_guide/copy_on_write.html>`__.
+    :ref:`Copy-on-Write <copy_on_write>`
     will become the new default in pandas 3.0. This means than chained indexing will
     never work. As a consequence, the ``SettingWithCopyWarning`` won't be necessary
     anymore.
-    See `this section <https://mathdatasimplified.com/2023/04/20/copy-on-write-mode-in-pandas-2-0/>`__
+    See :ref:`this section <copy_on_write_chained_assignment>`
     for more context.
     We recommend turning Copy-on-Write on to leverage the improvements with
 
@@ -1857,12 +1855,11 @@ Evaluation order matters
 
 .. warning::
 
-    `Copy-on-Write
-         <https://pandas.pydata.org/docs/dev/user_guide/copy_on_write.html>`__.
+    :ref:`Copy-on-Write <copy_on_write>`
     will become the new default in pandas 3.0. This means than chained indexing will
     never work. As a consequence, the ``SettingWithCopyWarning`` won't be necessary
     anymore.
-    See `this section <https://mathdatasimplified.com/2023/04/20/copy-on-write-mode-in-pandas-2-0/>`__
+    See :ref:`this section <copy_on_write_chained_assignment>`
     for more context.
     We recommend turning Copy-on-Write on to leverage the improvements with