Fix bug in example | Update auth.guard.ts

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PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message was generated by yarn commit
• Tests for the changes have been added (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] Tests
[ ] Release
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ x] No

Other information