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)

modules/tools/editorconfig/config.el

@@ -5,11 +5,12 @@
 ;; major mode to drop editorconfig a hint? This is accomplished by temporarily
 ;; appending an extension to `buffer-file-name' when we talk to editorconfig.
 (defvar +editorconfig-mode-alist
-  '((sh-mode     . "sh")
-    (python-mode . "py")
-    (ruby-mode   . "rb")
-    (perl-mode   . "pl")
-    (php-mode    . "php"))
+  '((sh-mode       . "sh")
+    (python-mode   . "py")
+    (ruby-mode     . "rb")
+    (enh-ruby-mode . "rb")
+    (perl-mode     . "pl")
+    (php-mode      . "php"))
   "An alist mapping major modes to extensions. Used by
 `doom*editorconfig-smart-detection' to give editorconfig filetype hints.")