Fix minor typo in hibernate-reactive.adoc

[BhagatHarsh]

I found a very minor typo while reading

Original: there is not JDBC in Hibernate Reactive
Modififed: there is no JDBC in Hibernate Reactive

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[quarkus-bot]

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It should be safe to merge provided you have a look at the other checks in the summary.

[gastaldi]

Good catch!

[github-actions]

🎊 PR Preview c1d8726 has been successfully built and deployed to https://quarkus-pr-main-40817-preview.surge.sh/version/main/guides/

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