chore: update import lazy-loading.md

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fixed demo code

PR Checklist

• [x] The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• [ ] If there is an issue related with this PR, point it out here.

What is the current state of the documentation article?

What is the new state of the documentation article?

Fixes/Implements/Closes #[Issue Number].

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Please disable this check for only one commit. It does not make any sense.