Remove TODOs that now have tickets (#4935)

api/post_test.go

@@ -1323,7 +1323,6 @@ func TestGetFileInfosForPost(t *testing.T) {
 	}
 }
 
-// TODO: Needs to be vastly fleshed out
 func TestSendNotifications(t *testing.T) {
 	th := Setup().InitBasic()
 	Client := th.BasicClient

api/websocket_test.go

@@ -13,7 +13,6 @@ import (
 	"github.com/mattermost/platform/model"
 )
 
-// XXX FIXME
 /*func TestWebSocketAuthentication(t *testing.T) {
 	th := Setup().InitBasic()
 	WebSocketClient, err := th.CreateWebSocketClient()