fix(nx-dev): copy command when using the terminal fence

[juristr]

When using the terminal output "fence" in the docs, the copy button should copy the command rather than the output itself

clicking the copy button copies nx run-many -t test lint e2e

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2023 9:06pm

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✅ Successfully ran 7 targets

• nx affected -t e2e-macos --parallel=1 --base= --head=
• nx affected --target=build --base=ed0136b1219aa66d327d1d9c4905786d0c1d920f --head=fdb8b1a2359402e0ce89e5f8fcd19cb1b640ab35 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files depcheck check-codeowners --parallel=1 --no-dte
• nx affected --target=test --base=ed0136b1219aa66d327d1d9c4905786d0c1d920f --head=fdb8b1a2359402e0ce89e5f8fcd19cb1b640ab35 --parallel=1
• nx affected --target=lint --base=ed0136b1219aa66d327d1d9c4905786d0c1d920f --head=fdb8b1a2359402e0ce89e5f8fcd19cb1b640ab35 --parallel=3
• nx-cloud record -- nx format:check --base=ed0136b1219aa66d327d1d9c4905786d0c1d920f --head=fdb8b1a2359402e0ce89e5f8fcd19cb1b640ab35
• nx documentation --no-dte

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