Add more details in error message for invalid vote option (#9185)

Co-authored-by: Marko <marbar3778@yahoo.com>
Co-authored-by: Amaury <1293565+amaurym@users.noreply.github.com>

x/gov/types/vote.go

@@ -89,7 +89,7 @@ func ValidWeightedVoteOption(option WeightedVoteOption) bool {
 func VoteOptionFromString(str string) (VoteOption, error) {
 	option, ok := VoteOption_value[str]
 	if !ok {
-		return OptionEmpty, fmt.Errorf("'%s' is not a valid vote option", str)
+		return OptionEmpty, fmt.Errorf("'%s' is not a valid vote option, available options: yes/no/no_with_veto/abstain", str)
 	}
 	return VoteOption(option), nil
 }