Fix completion symbol name in README

Fix one of the jinx's function not defined warning

cape-jinx-completion.el

@@ -50,15 +50,18 @@
 (defun cape-jinx-completion-suggest-for-word (word)
   "Return suggestions as a list for `WORD'."
   (when (not jinx--dicts)
-    (when (not (fboundp #'jinx--mod-dict))
+    (when (not (fboundp 'jinx--mod-dict))
       (jinx--load-module))
     (jinx--load-dicts))
+  (if (fboundp 'jinx--mod-suggest)
   (let* ((result '()))
     (dolist (dict jinx--dicts)
       (dolist (el (jinx--mod-suggest dict word))
         (when (string-prefix-p word el)
           (cl-pushnew el result))))
-    (delete-dups result)))
+    (delete-dups result))
+  ;; this should never happen, as jinx--load-module will bind jinx--mod-suggest as well.
+  '()))
 
 ;; cape-jinx-completion (based on cape-dict)
 (defgroup cape-jinx-completion nil