Update giga-usb.md to correct typo

[PPPDUD]

What This PR Changes

• Corrected a typographical error.

Contribution Guidelines

• I confirm that I have read the contribution guidelines and comply with them.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[jhansson-ard]

@PPPDUD please sign the CLA so that we can properly review your PR, thank you 🙏🏼

[PPPDUD]

@PPPDUD please sign the CLA so that we can properly review your PR, thank you 🙏🏼

To quote the CLA:

Subject to the terms and conditions of this CLA, You hereby grant to Arduino and to recipients of software distributed by Arduino a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license, under your copyrights, to copy, modify, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Your Contributions and any such derivative works containing or otherwise based upon Your Contribution.

I don't know that I wish to give Qualcomm a perpetual, unrestricted, irrevocable license to a broad portion of my work unless I say "Not a Contribution". You and your users may adopt this contribution (and only this contribution) and use it under a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license, in which you may copy, modify, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute, but I don't want that to automatically apply in the future.

Edit: I just released that this quote has more stuff to it than I initially thought; updated my comment.

[PPPDUD]

Also, why should I be due to arbitration in Chiasso, Switzerland? I'm from the United States and would find it excessively burdensome to deal with foreign law and customs.