Better enh-ruby-mode suport in doom/describe-module & editorconfig

+ Associates enh-ruby-mode with :lang ruby for doom/describe-module
+ Enables editorconfig to detect extension-less or file-less ruby
  files (from shebang lines or file local variables).

core/autoload/help.el

@@ -28,6 +28,7 @@
     (python-mode :lang python)
     (restclient-mode :lang rest)
     (ruby-mode :lang ruby)
+    (enh-ruby-mode :lang ruby)
     (rust-mode :lang rust)
     (scala-mode :lang scala)
     (sh-mode :lang sh)