Fix some more typos

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

test/mix/tasks/pleroma/ecto/rollback_test.exs

@@ -13,7 +13,7 @@ defmodule Mix.Tasks.Pleroma.Ecto.RollbackTest do
 
     assert capture_log(fn ->
              Mix.Tasks.Pleroma.Ecto.Rollback.run(["--env", "test"])
-           end) =~ "[info] Rollback succesfully"
+           end) =~ "[info] Rollback successfully"
 
     Logger.configure(level: level)
   end

test/mix/tasks/pleroma/robots_txt_test.exs

@@ -26,7 +26,7 @@ defmodule Mix.Tasks.Pleroma.RobotsTxtTest do
     assert file == "User-Agent: *\nDisallow: /\n"
   end
 
-  test "to existance folder" do
+  test "to existing folder" do
     path = "test/fixtures/"
     file_path = path <> "robots.txt"
     clear_config([:instance, :static_dir], path)