Docker: Fix UI text

- Write Docker with an initial capital letter
- Rewrite a tooltip to add reasons for adding a flag first, and
  then the flag.

Change-Id: I8b4f3775ad618999faddec90b62ba7bb11ac23ae
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/docker/dockerdevice.cpp

@@ -749,7 +749,7 @@ bool DockerDevicePrivate::startContainer()
         DockerApi::recheckDockerDaemon();
         MessageManager::writeFlashing(Tr::tr("Docker daemon appears to be not running. "
                                              "Verify daemon is up and running and reset the "
-                                             "docker daemon on the docker device settings page "
+                                             "Docker daemon in Docker device preferences "
                                              "or restart Qt Creator."));
     });