Merge pull request #9849 from 13x1/patch-1

Fix typo in primops.cc (and therefore Nix docs)

Author: thufschmitt

src/libexpr/primops.cc

@@ -1878,7 +1878,7 @@ static RegisterPrimOp primop_outputOf({
       For instance,
       ```nix
       builtins.outputOf
-        (builtins.outputOf myDrv "out)
+        (builtins.outputOf myDrv "out")
         "out"
       ```
       will return a placeholder for the output of the output of `myDrv`.