ox-html: Fix docstring

* lisp/ox-html.el (org-html-protect-char-alist): Fix docstring.

Reported-by: Marcin Borkowski <mbork@wmi.amu.edu.pl>

lisp/ox-html.el

@@ -794,7 +794,7 @@ link's path."
   '(("&" . "&")
     ("<" . "&lt;")
     (">" . "&gt;"))
-  "Alist of characters to be converted by `org-html-protect'.")
+  "Alist of characters to be converted by `org-html-encode-plain-text'.")
 
 ;;;; Src Block