ob-core: Fix docstring

* lisp/ob-core.el (org-babel-results-keyword): NAME cannot be used for
  results, as it is a reserved affiliated keyword.

lisp/ob-core.el

@@ -137,8 +137,7 @@ remove code block execution from the C-c C-c keybinding."
 
 (defcustom org-babel-results-keyword "RESULTS"
   "Keyword used to name results generated by code blocks.
-Should be either RESULTS or NAME however any capitalization may
-be used."
+It should be RESULTS.  However any capitalization may be used."
   :group 'org-babel
   :version "24.4"
   :package-version '(Org . "8.0")