Fix a couple of requires to require ox-publish, not org-publish.

org-tutorials/org-publish-html-tutorial.org

@@ -174,7 +174,7 @@
    make sure all the /components/ are enclosed by the lines
 
 #+begin_src emacs-lisp
-(require 'org-publish)
+(require 'ox-publish)
 (setq org-publish-project-alist
       '(
 

org-tutorials/org-publish-layersmenu.org

@@ -99,7 +99,7 @@
   add this to your publishing project's definition:
 
 #+begin_src emacs-lisp
-(require 'org-publish)
+(require 'ox-publish)
 (setq org-publish-project-alist
       '(("org-notes"
          :base-directory "~/org/notes/"