Backport commit 85e9e5f61 from Emacs

* lisp/ox-html.el (org-html-htmlize-output-type):
* lisp/org-agenda.el (org-agenda-do-in-region): Don't quote t and nil.

Don't quote nil and t in doc strings and comments
85e9e5f616fb0fd0819a04006d6d2a0fb6d93ad7
Lars Ingebrigtsen
Tue Sep 21 22:11:43 2021 +0200

lisp/org-agenda.el

@@ -8842,7 +8842,7 @@ Point is in the buffer where the item originated.")
 
 (defun org-agenda-do-in-region (beg end cmd &optional arg force-arg delete)
   "Between region BEG and END, call agenda command CMD.
-When optional argument ARG is non-nil or FORCE-ARG is `t', pass
+When optional argument ARG is non-nil or FORCE-ARG is t, pass
 ARG to CMD.  When optional argument DELETE is non-nil, assume CMD
 deletes the agenda entry and don't move to the next entry."
   (save-excursion

lisp/ox-html.el

@@ -874,7 +874,7 @@ link's path."
 (defcustom org-html-htmlize-output-type 'inline-css
   "Output type to be used by htmlize when formatting code snippets.
 Choices are `css' to export the CSS selectors only,`inline-css'
-to export the CSS attribute values inline in the HTML or `nil' to
+to export the CSS attribute values inline in the HTML or nil to
 export plain text.  We use as default `inline-css', in order to
 make the resulting HTML self-containing.