The current README.md shipped in the toolbox image doesn't use the current name of the project, which is Toolbx, and has a broken OSTree URL. So, it will be good to update it.

These are the relevant upstream commits:

• Drop one "o" and rename the project as "Toolbx"
  https://github.com/containers/toolbox/commit/c3403dae8cb0544ecaa94abdcd5eb3c896851b90

• Unbreak OSTree URL
  https://github.com/containers/toolbox/commit/96ca9c65639722bcbc352ee247b3de6dfd8b42d6

The README.md is purely for documentation, and shouldn't impact code functionality.