patch 9.1.1182: No cmdline completion for 'completefuzzycollect'

Problem:  No cmdline completion for the 'completefuzzycollect' option
          (after v9.1.1178)
Solution: Add cmdline completion for the 'completefuzzycollect' option,
          improve its description in optwin.vim (zeertzjq).

closes: #16813

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/optionstr.c

@@ -1659,6 +1659,20 @@ did_set_completefuzzycollect(optset_T *args UNUSED)
     return NULL;
 }
 
+    int
+expand_set_completefuzzycollect(
+	optexpand_T *args,
+	int *numMatches,
+	char_u ***matches)
+{
+    return expand_set_opt_string(
+	    args,
+	    p_cfc_values,
+	    ARRAY_LENGTH(p_cfc_values) - 1,
+	    numMatches,
+	    matches);
+}
+
 /*
  * The 'completeitemalign' option is changed.
  */