Update examples in README for string_t usage

Author: rouson

README.md

@@ -91,7 +91,7 @@ Example expression                               | Result
 `string_t(["a", "b", "c"])`                      | `[string_t("a"), string_t("b"), string_t("c")]`
 `.cat. string_t([9,8,7])`                        | `string_t("987")`
 `.csv. string_t([1.5,2.0,3.25])`                 | `string_t("1.50000000,2.00000000,3.25000000")`
-`"-" .separatedBy. string_t([1,2,4])`            | `string_t("1-2-4")`
+`string_t([1,2,4]) .separatedBy. "-"`            | `string_t("1-2-4")`
 `string_t("ab") // string_t("cd")`               | `string_t("abcd")`
 `"ab" // string_t("cd")`                         | `string_t("abcd")`
 `string_t("ab") // "cd"`                         | `string_t("abcd")`