Merge pull request #6900 from kenjis/fix-docs-tutorial-4.3

docs: improve Tutorial v4.3

Author: kenjis

user_guide_src/source/images/debugbar.png

@@ -102,6 +102,8 @@ the ``$rules`` array with the name of the group as defined in **app/Config/Valid
 
 .. note:: Validation can also be handled automatically in the model, but sometimes it's easier to do it in the controller. Where is up to you.
 
+.. _controller-validatedata:
+
 $this->validateData()
 =====================
 

user_guide_src/source/images/tutorial1.png

@@ -109,6 +109,8 @@ may alter this behavior by editing the following config parameter value in
 .. note:: Since v4.2.3, you can regenerate CSRF token manually with the
     ``Security::generateHash()`` method.
 
+.. _csrf-redirection-on-failure:
+
 Redirection on Failure
 ----------------------
 

user_guide_src/source/images/tutorial2.png

@@ -364,6 +364,8 @@ update command, with the added benefit of validation, events, etc:
 
 .. literalinclude:: model/018.php
 
+.. _model-save:
+
 save()
 ------
 

user_guide_src/source/images/tutorial3.png

@@ -10,9 +10,9 @@ design patterns, which you can expand upon.
 Now that you've completed this tutorial, we recommend you check out the
 rest of the documentation. CodeIgniter is often praised because of its
 comprehensive documentation. Use this to your advantage and read the
-:doc:`Overview </concepts/index>` and :doc:`/general/index`
+:doc:`Overview <../concepts/index>` and :doc:`../general/index`
 sections thoroughly. You should read
-the :doc:`Library </libraries/index>` and :doc:`/helpers/index` references when needed.
+the :doc:`Library <../libraries/index>` and :doc:`../helpers/index` references when needed.
 
 Every intermediate PHP programmer should be able to get the hang of
 CodeIgniter within a few days.