Spring Fix broken link to vavr in the reference guide

Rolling Back a Declarative Transaction page has broken link and not applied asciidocs url syntax

official Vavr documentation is https://docs.vavr.io/ check here https://github.com/vavr-io/vavr-docs

according to Antora docs, it should be

https://docs.vavr.io/#_try[official Vavr documentation]

origin is

[official Vavr documentation](https://www.vavr.io/vavr-docs/#_try)

Comment From: snicoll

@qww1552 thank you for making your first contribution to Spring Framework.

It looks like you created this PR from a tag as it contains an extra commit that changes the version. Going forward, please create a branch from main.