Modify syntax entry for < and > globally

* lisp/org.el (org-mode): Let < and > be recognized as opening
and ending characters.

These characters are typically used in timestamps where it is useful
to use C-M-f and C-M-b to manipulate them.

lisp/org.el

@@ -5435,6 +5435,8 @@ The following commands are available:
   (modify-syntax-entry ?\" "\"")
   (modify-syntax-entry ?\\ "_")
   (modify-syntax-entry ?~ "_")
+  (modify-syntax-entry ?< "(>")
+  (modify-syntax-entry ?> ")<")
   (setq-local font-lock-unfontify-region-function 'org-unfontify-region)
   ;; Activate before-change-function
   (setq-local org-table-may-need-update t)