Update meaning of sudo

[Leonabcd123]

Why:

As mentioned in the Wikipedia page we're linking to (https://en.wikipedia.org/wiki/Sudo) and in the official sudo website (https://www.sudo.ws/), the updated meaning of sudo is su "do", which means substitute user do, rather than superuser do.

What's being changed:

superuser do -> substitute user do

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Source	Review	Production	What Changed
authentication/keeping-your-account-and-data-secure/sudo-mode.md	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14

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