Improve formatting of primop_fromTOML

Trailing comma helps a lot.

Author: Ericson2314

src/libexpr/primops/fromTOML.cc

@@ -170,10 +170,10 @@ static void prim_fromTOML(EvalState & state, const PosIdx pos, Value ** args, Va
     }
 }
 
-static RegisterPrimOp primop_fromTOML(
-    {.name = "fromTOML",
-     .args = {"e"},
-     .doc = R"(
+static RegisterPrimOp primop_fromTOML({
+    .name = "fromTOML",
+    .args = {"e"},
+    .doc = R"(
       Convert a TOML string to a Nix value. For example,
 
       ```nix
@@ -187,6 +187,7 @@ static RegisterPrimOp primop_fromTOML(
 
       returns the value `{ s = "a"; table = { y = 2; }; x = 1; }`.
     )",
-     .fun = prim_fromTOML});
+    .fun = prim_fromTOML,
+});
 
 } // namespace nix