Merge pull request #5476 from kenjis/fix-docs-environments.rst

docs: fix environments.rst

Author: kenjis

user_guide_src/source/general/environments.rst

@@ -97,17 +97,9 @@ is affected.
 Error Reporting
 ---------------
 
-Setting the ENVIRONMENT constant to a value of 'development' will cause
+Setting the ENVIRONMENT constant to a value of ``development`` will cause
 all PHP errors to be rendered to the browser when they occur.
-Conversely, setting the constant to 'production' will disable all error
+Conversely, setting the constant to ``production`` will disable all error
 output. Disabling error reporting in production is a
 :doc:`good security practice </concepts/security>`.
 
-Configuration Files
--------------------
-
-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 Handling Different Environments section of the
-:doc:`Working with Configuration Files </general/configuration>` documentation.