Fix example for Basis * Vector3 in documentation

[mart3323]

Description

This MR fixes an invalid example in the Basis documentation, fixes godotengine/godot-docs#9394

I opted to change the inputs instead of the outputs, because it seemed strange to have two identical basis vectors. Plus this allows some of the inputs to be negative

Actions performed

• Cloned both projects, symlinked them together and ran the build both before and after the changes to confirm they show up where expected
• Retested the GDScript example in editor to confirm the new example gives the promised result
• ⚠️ Did not test the C# example. Though I have no reason to believe it should run any different
• Checked the original MR to see if there were any comments about this example to be aware of
• Ran pre-commit hooks (4 passed, rest skipped)

[Mickeon]

Although I'd be more in favour of correcting the "Prints" statement, this is correct, too. Thank you for cleaning after me.

[mart3323]

Although I'd be more in favour of correcting the "Prints" statement, this is correct, too. Thank you for cleaning after me.

Any specific reason?
If desired, I have no problem changing it - either to the original

  var my_basis = Basis(Vector3(1, 1, 1), Vector3(1, 1, 1), Vector3(0, 2, 5))
  print(my_basis * Vector3(1, 2, 3)) # Prints (3, 9, 18)

or a hybrid that just barely changes the inputs to make them different

  var my_basis = Basis(Vector3(1, 1, 1), Vector3(1, -1, 1), Vector3(0, 2, 5))
  print(my_basis * Vector3(1, 2, 3)) # Prints (3, 5, 18)

or to some new example like

  # Basis that swaps the x/z axis and doubles the scale
  var my_basis = Basis(Vector3(0, 2, 0), Vector3(2, 0, 0), Vector3(0, 0, 2))
  print(my_basis * Vector3(1,2,3)) # Prints (4, 2, 6)

[Mickeon]

It is mostly to keep the numbers simpler and easier to digest (although a transformation is anything but simple at a glance).

I like the new example you proposed.

[akien-mga]

I rebased the PR to fix the (temporary) CI issue, and did the couple tweaks I had suggested while at it.

[akien-mga]

Thanks! And congrats for your first merged Godot contribution 🎉