docs: improve docs

Author: kenjis

user_guide_src/source/general/environments.rst

@@ -30,6 +30,8 @@ By default, CodeIgniter has three environments defined.
 If you want another environment, e.g., for staging, you can add custom environments.
 See `Adding Environments`_.
 
+.. _setting-environment:
+
 *******************
 Setting Environment
 *******************

user_guide_src/source/general/errors.rst

@@ -49,8 +49,12 @@ Error Reporting
 ---------------
 
 By default, CodeIgniter will display a detailed error report with all errors in the ``development`` and ``testing`` environments, and will not
-display any errors in the ``production`` environment. You can change this by setting the ``CI_ENVIRONMENT`` variable
-in the :ref:`.env <dotenv-file>` file.
+display any errors in the ``production`` environment.
+
+.. image:: ../images/error.png
+
+You can change your environment by setting the ``CI_ENVIRONMENT`` variable.
+See :ref:`setting-environment`.
 
 .. important:: Disabling error reporting DOES NOT stop logs from being written if there are errors.