* Modify rule S6398: Add How to fix it in Spring
* Update rules/S6398/java/how-to-fix-it/spring.adoc
Co-authored-by: gaetan-ferry-sonarsource <112399173+gaetan-ferry-sonarsource@users.noreply.github.com>
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Co-authored-by: gaetan-ferry-sonarsource <112399173+gaetan-ferry-sonarsource@users.noreply.github.com>
Inline adoc files when they are included exactly once.
Also fix language tags because this inlining gives us better information
on what language the code is written in.