docs: add link to other page

Author: kenjis

user_guide_src/source/general/errors.rst

@@ -50,7 +50,7 @@ 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 **.env** file.
+in the :ref:`.env <dotenv-file>` file.
 
 .. important:: Disabling error reporting DOES NOT stop logs from being written if there are errors.