Fix asciidoc errors in kitchensink guide

[jmesnil]

This guide is referred in WildFly and shows theses errors (https://github.com/wildfly/wildfly/blob/main/docs/src/main/asciidoc/Getting_Started_Developing_Applications_Guide.adoc\#L50)

[emmartins]

@jmesnil I approved but I would like to propose something different, to be done in WFLY docs...
This content that you changed is quite outdated, honestly I would like to get ridden of it, and now we are deploying quickstarts READMEs to https://docs.wildfly.org/quickstart/ , so IMHO we should just change the link at https://docs.wildfly.org/#_quickstarts , currently pointing to https://docs.wildfly.org/37/Quickstarts.html , with https://docs.wildfly.org/quickstart/
WDYT?

[jmesnil]

@emmartins Yes, that's a good idea but this would not solve the error we have from WildFly docs that still refer to this old content in https://github.com/wildfly/wildfly/blob/68bc534d9ef0adf349c10b278d7a310d429763ab/docs/src/main/asciidoc/Getting_Started_Developing_Applications_Guide.adoc#L48.

So we would still need to update WildFly docs with the new URLs (such as https://docs.wildfly.org/quickstart/kitchensink/README.html).
Is that correct?

[emmartins]

@jmesnil yes, at least for now, I think we should replace that content with the guide from https://github.com/wildfly/wildfly-application-development-book , but I will add that to the future of apps doc, I still need a good way to plug such separated repo content in wildfly docs, and it's too late for WFLY 38