tests/nixos/fetch-git: Apply suggestions

tests/nixos/fetch-git/default.nix

@@ -24,7 +24,7 @@
   testCases =
     map
     (testCaseName: {...}: {
-      imports = ["${./test-cases}/${testCaseName}"];
+      imports = [ (./test-cases + "/${testCaseName}") ];
       # ensures tests are named like their directories they are defined in
       name = testCaseName;
     })

tests/nixos/fetch-git/testsupport/setup.nix

@@ -39,9 +39,6 @@ in
             The name of the test case.
 
             A repository with that name will be set up on the gitea server and locally.
-
-            This name can also be used to execute only a single test case via:
-              `nix build .#hydraJobs.fetch-git.{test-case-name}`
           '';
         };
         options.description = mkOption {