docs(nx-dev): update define-environment-variables.md changed NX_ to…

[barrymichaeldoyle]

Current Behavior

Incorrect environment variable prefix NX_ in docs.

Expected Behavior

Correct environment variable prefix NX_PUBLIC_ in docs.

Related Issue(s)

#23362

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Name	Status	Preview	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	May 15, 2024 8:42am

[nx-cloud]

☁️ Nx Cloud Report

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✅ Successfully ran 6 targets

• nx affected --targets=e2e,e2e-ci --base=a2a7d7eaf74ccc05393ba8602718b20cd34d4dda --head=c3a422cd65bfffef5bfaa0725a3dc35751b51197 --parallel=1
• nx affected --targets=lint,test,build --base=a2a7d7eaf74ccc05393ba8602718b20cd34d4dda --head=c3a422cd65bfffef5bfaa0725a3dc35751b51197 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=a2a7d7eaf74ccc05393ba8602718b20cd34d4dda --head=c3a422cd65bfffef5bfaa0725a3dc35751b51197
• nx documentation --no-dte
• nx affected -t e2e-macos-ci --parallel=1 --base=a2a7d7eaf74ccc05393ba8602718b20cd34d4dda --head=c3a422cd65bfffef5bfaa0725a3dc35751b51197

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[github-actions]

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