Fixed user guide internal & external links to resolve problems reported by sphinx "make linkcheck"
Signed-off-by:Master Yoda <jim_parry@bcit.ca>
diff --git a/user_guide_src/source/general/environments.rst b/user_guide_src/source/general/environments.rst
index 1ce4fde..f5a4f61 100644
--- a/user_guide_src/source/general/environments.rst
+++ b/user_guide_src/source/general/environments.rst
@@ -48,5 +48,5 @@
 Optionally, you can have CodeIgniter load environment-specific
 configuration files. This may be useful for managing things like
 differing API keys across multiple environments. This is described in
-more detail in the environment section of the `Config
-Class <../libraries/config.html#environments>`_ documentation.
\ No newline at end of file
+more detail in the environment section of the :doc:`Config
+Class <../libraries/config#environments>`_ documentation.
\ No newline at end of file