Update title for Helm Spacemacs Documentation

- Don't need to add "Helm".

- Add some info to quickhelp.

- Increase the line-width of org-kbd to 2 to make it more visible as a
  button.

core/core-themes-support.el

@@ -15,7 +15,7 @@
 
 (defface org-kbd
   '((t (:background "LemonChiffon1" :foreground "black" :box
-                    (:line-width 1 :color nil :style released-button))))
+                    (:line-width 2 :color nil :style released-button))))
   "Face for displaying key bindings in Spacemacs documents."
   :group 'org-faces)
 

core/info/quickhelp.txt

@@ -16,10 +16,10 @@ Press SPC f e d (Vim) or Alm-m f e d (Emacs) to access .spacemacs file.
 
 Press SPC f e h (Vim) or Alt-m f e h (Emacs) to access a list of documentation
 and supported layers. You can type anything to narrow to a specific feature i.e.
-"python" for Python layer. There are five lists and you can press C-o to switch
+"python" for Python layer. There are five lists and you can press Ctrl-o to switch
 between them:
 
 - Spacemacs documentation -> Layer documentation -> Package Source Code ->
   Dotfile variables -> Spacemacs toggles
 
-Please consult Spacemacs documentation for more details.
+Please consult Spacemacs documentation from SPC f e h for more details.

spacemacs/extensions/helm-spacemacs/helm-spacemacs.el

@@ -80,7 +80,7 @@
 
 (defun helm-spacemacs//documentation-source ()
   "Construct the helm source for the documentation section."
-  (helm-build-sync-source "Helm Spacemacs Documentation"
+  (helm-build-sync-source "Spacemacs Documentation"
     :candidates #'helm-spacemacs//documentation-candidates
     :persistent-action #'helm-spacemacs//documentation-action-open-file
     :keymap helm-map