Clarify that `DO_NOT_TRACK` only disables telemetry if `1` or `true`

[hashcatHitman]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/github-cli/github-cli/github-cli-telemetry#how-to-opt-out

What part(s) of the article would you like to see updated?

The section on environment variables currently looks like this:

Environment variables:

export GH_TELEMETRY=false

Any falsy value works: 0, false, disabled, or an empty string. You can also use the DO_NOT_TRACK convention:

export DO_NOT_TRACK=true

Saying that any falsy value works for GH_TELEMETRY right before introducing DO_NOT_TRACK can create the implication that any truthy value would be accepted for DO_NOT_TRACK. I believe this is not the case though; it looks like DO_NOT_TRACK must be 1 or true. It would be nice to clarify this.

It also seems like most people set DO_NOT_TRACK to 1 anyway, so it would be good to be explicit for the opposite reason too; we don't want people to assume that only true is accepted.

Additional information

No response

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