org-link-descriptive: Fix docstring typo

* lisp/ol.el (org-link-descriptive): Drop extra word from docstring.

lisp/ol.el

@@ -183,7 +183,7 @@ link.
 (defcustom org-link-descriptive t
   "Non-nil means Org displays descriptive links.
 
-E.g. [[https://orgmode.org][Org website]] is be displayed as
+E.g. [[https://orgmode.org][Org website]] is displayed as
 \"Org Website\", hiding the link itself and just displaying its
 description.  When set to nil, Org displays the full links
 literally.