chore(docs): Update typo in example

[assembled-wei-wei]

This PR contains a:

• [ ] bugfix
• [ ] new feature
• [ ] code refactor
• [ ] test update
• [x] typo fix
• [ ] metadata update

Motivation / Use-Case

fixes #989

Breaking Changes

Additional Info

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: assembled-wei-wei / name: Wei-Wei Wu (da7974bb23fe0cf51044b0c47a391c3e7720c673)

[codecov[bot]]

Codecov Report

Base: 90.34% // Head: 90.34% // No change to project coverage :thumbsup:

Coverage data is based on head (da7974b) compared to base (331031a). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #990 +/- ## ======================================= Coverage 90.34% 90.34% ======================================= Files 5 5 Lines 829 829 Branches 221 221 ======================================= Hits 749 749 Misses 70 70 Partials 10 10 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webpack-contrib). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webpack-contrib)

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[alexander-akait]

Thank you