create-cli: Minor improvements to enum example

doc/Language/create-cli.pod6

@@ -200,23 +200,23 @@ C<Enumeration>s can be used in signatures with arguments converted
 automatically to its corresponding C<enum> symbol:
 
 =begin code
-enum Flags  (
+enum Flag  (
     FLAG_FOO => 0b001,
     FLAG_BAR => 0b010,
     FLAG_BAZ => 0b100,
 );
 
-sub MAIN( Enumeration $flag = FLAG_FOO) {
+sub MAIN(Flag $flag = FLAG_FOO) {
     say "Flagging $flag";
 }
 =end code
 
 This will work correctly with
 
 =for code :lang<text>
-raku MAIN-enum.p6 FLAG_BAR
+raku MAIN-enum.raku FLAG_BAR
 
-but will die if called with something that is not an enum.
+but will die if called with something that is not a C<Flag>.
 
 X<|%*SUB-MAIN-OPTS>
 =head2 %*SUB-MAIN-OPTS