Fix some defcustoms types

* lisp/ob-stan.el (org-babel-stan-cmdstan-directory):
* lisp/org.el (org-latex-default-packages-alist):
* lisp/ox-odt.el (org-odt-with-latex): Fix type mismatch.

Fixes: 29695

lisp/ob-stan.el

@@ -49,11 +49,12 @@
 
 (defcustom org-babel-stan-cmdstan-directory nil
   "CmdStan source directory.
-'make' will be called from this directory to compile the Stan
-block.  When nil, executing Stan blocks dumps the content to a
-plain text file."
+Call \"make\" from this directory to compile the Stan block.
+When nil, executing Stan blocks dumps the content to a file."
   :group 'org-babel
-  :type 'string)
+  :type '(choice
+	  (directory :tag "Compilation directory")
+	  (const :tag "Dump to a file" nil)))
 
 (defvar org-babel-default-header-args:stan
   '((:results . "file")))

lisp/org.el

@@ -4167,7 +4167,10 @@ A string will be inserted as-is in the header of the document."
 	   (list :tag "options/package pair"
 		 (string :tag "options")
 		 (string :tag "package")
-		 (boolean :tag "Snippet"))
+		 (boolean :tag "Snippet")
+		 (choice
+		  (const :tag "For all compilers" nil)
+		  (repeat :tag "Allowed compiler" string)))
 	   (string :tag "A line of LaTeX"))))
 
 (defcustom org-latex-packages-alist nil

lisp/ox-odt.el

@@ -721,16 +721,17 @@ nil            Ignore math snippets.
                imagemagick to convert pdf files to png files.
 `mathjax'      Do MathJax preprocessing and arrange for MathJax.js to
                be loaded.
-t              Synonym for `mathjax'."
+
+Any other symbol is a synonym for `mathjax'."
   :group 'org-export-odt
   :version "24.4"
   :package-version '(Org . "8.0")
   :type '(choice
 	  (const :tag "Do not process math in any way" nil)
+	  (const :tag "Leave math verbatim" verbatim)
 	  (const :tag "Use dvipng to make images" dvipng)
 	  (const :tag "Use imagemagick to make images" imagemagick)
-	  (const :tag "Use MathJax to display math" mathjax)
-	  (const :tag "Leave math verbatim" verbatim)))
+	  (other :tag "Use MathJax to display math" mathjax)))
 
 
 ;;;; Links