reorder arguments to better capture their relation

rfcs/0137-nix-language-version.md

@@ -67,9 +67,10 @@ where `<version>` is a released version of Nix the given file is intended to wor
  * (+) This would serve other Nix language evaluators which are not and should not be tied to the rest of Nix.
  * (-) `builtins.langVersion` is currently only internal and undocumented.
  * (+) Documentation is easy to add.
- * (-) Requires adding another built-in or command line option to the public API.
+  * (-) Requires adding another built-in to the public API.
  * (-) Using a language feature requires an additional steps from users to determine the current version.
  * (+) We can add a command line option such that it is not more effort than `nix --version`.
+ * (-) Requires adding another command line option to the public API.
  * (+) The Nix language version is decoupled Nix version numbering.
  * (+) It changes less often than the Nix version.
  * (-) That was probably due to making changes being so hard.