README: mentioning sec spend key and seed are optional in validate_components_for_login

README.md

@@ -140,7 +140,7 @@ In future, the key names could be compressed.
 
 **`validate_components_for_login`**
 
-* Args: `nettype_string: NettypeString`, `address_string: String`, `sec_viewKey_string: String`, `sec_spendKey_string: String`, `seed_string: String`
+* Args: `nettype_string: NettypeString`, `address_string: String`, `sec_viewKey_string: String`, `sec_spendKey_string: Optional<String>`, `seed_string: Optional<String>`
 
 * Returns: `err_msg: String` *OR* `pub_spendKey_string: String`, `pub_viewKey_string: String`, `isInViewOnlyMode: Boolstring`, and `isValid: Boolstring`