Update override_dir_structure.rst

Author: DocFX

configuration/override_dir_structure.rst

@@ -32,7 +32,7 @@ override it to create your own structure:
 .. _override-env-dir:
 
 Override the Environment (DotEnv) Files Directory
-------------------------------------
+-------------------------------------------------
 
 Though the environment files directory is supposed to be the current project 
 root directory, you can actually set it via Composer or specifically in each