Fix spelling in entity creation (backport #688)

[mergify]

🦟 Bug fix

Fixes minor spelling mistake in entity creation message.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)

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This is an automatic backport of pull request #688 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 5e3b073 has failed:

On branch mergify/bp/humble/pr-688
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Unmerged paths:
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	both modified:   ros_gz_sim/src/create.cpp

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