Fixed markdown syntax in helloworld-java-spring/README.md

[hbelmiro]

This PR fixes the syntax of code-samples/serving/hello-world/helloworld-java-spring/README.md, which is mixing Markdown and Asciidoc syntaxes.

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[knative-prow[bot]]

Welcome @hbelmiro! It looks like this is your first PR to knative/docs 🎉

[knative-prow[bot]]

Hi @hbelmiro. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[abrennan89]

@hbelmiro it's not actually asciidoc; we use Material for mkdocs to provide tabbed content. See https://squidfunk.github.io/mkdocs-material/reference/content-tabs/#grouping-code-blocks

[abrennan89]

Leaving this PR open until we decide whether to contain these code samples in the website or just the repo. For the website the == formatting would be valid. If it's just staying in the repo we can merge this PR.

/hold /ok-to-test

[snneji]

Leaving this PR open until we decide whether to contain these code samples in the website or just the repo. For the website the == formatting would be valid. If it's just staying in the repo we can merge this PR.

@abrennan89 We made the decision a while ago that it would be easier to maintain these code samples in GitHub and link out to them from the site. If you would like us to review this decision, we can discuss in the WG meeting.

[hbelmiro]

Thanks for the review @snneji. I applied your suggestions.

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abrennan89, hbelmiro

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