Fix which port the ADIS16470 is plugged into by default

[Technologyman00]

The documentation says that the ADIS16470 is plugged into the MXP by default which is not true. It should say SPI Port

Reference: https://first.wpi.edu/wpilib/allwpilib/docs/release/java/src-html/edu/wpi/first/wpilibj/ADIS16470_IMU.html#line.281

[sciencewhiz]

Per https://docs.wpilib.org/en/stable/docs/contributing/frc-docs/contribution-guidelines.html#creating-a-pr PRs should be targeted to main. Please rebase on main.

[Technologyman00]

Ok I made the change. Apologies

[sciencewhiz]

the commit needs to be rebased on main, not just the base branch changed, since it now picks up unrelated changes