chore: update spring plugin description for Maven (#1203)
chore: update spring plugin description for Maven (#1203)

The `spring` compiler plugin in Maven depends on the `kotlin-maven-allopen` plugin dependency, so the documentation should mention it explicitly. Otherwise it may have been confusing since the Gradle dependency is called `kotlin-spring`, but there is no such artifact for Maven.
hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn