docs: change from important to warning

It is security thing.

Author: kenjis

user_guide_src/source/general/configuration.rst

@@ -115,7 +115,7 @@ overwritten. The loaded Environment variables are accessed using any of the foll
     $s3_bucket = $_ENV['S3_BUCKET'];
     $s3_bucket = $_SERVER['S3_BUCKET'];
 
-.. important:: Note that your settings from the **.env** file are added to Environment Variables. As a side effect, this means that if your CodeIgniter application is (for example) generating a ``var_dump($_ENV)`` or ``phpinfo()`` (for debugging or other valid reasons) **your secure credentials are publicly exposed**.
+.. warning:: Note that your settings from the **.env** file are added to Environment Variables. As a side effect, this means that if your CodeIgniter application is (for example) generating a ``var_dump($_ENV)`` or ``phpinfo()`` (for debugging or other valid reasons) **your secure credentials are publicly exposed**.
 
 Nesting Variables
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