Use text-mode-abbrev-table as parent for the table in Org-mode

Patch from Leo

lisp/org.el

@@ -4141,6 +4141,9 @@ The following commands are available:
       (org-indent-mode 1))
     (org-set-startup-visibility)))
 
+(abbrev-table-put org-mode-abbrev-table
+                  :parents (list text-mode-abbrev-table))
+
 (put 'org-mode 'flyspell-mode-predicate 'org-mode-flyspell-verify)
 
 (defun org-current-time ()