Document jreleaser/jreleaser#1709

Author: aalmiray

docs/modules/reference/pages/project.adoc

@@ -1541,6 +1541,12 @@ include::partial$envvars-header.adoc[]
 | jreleaser.project.snapshot.label          | JRELEASER_PROJECT_SNAPSHOT_LABEL
 2+| *snapshot.fullChangelog*
 | jreleaser.project.snapshot.full.changelog | JRELEASER_PROJECT_SNAPSHOT_FULL_CHANGELOG
+2+| *java.artifactId*
+| jreleaser.project.java.artifact.id        | JRELEASER_PROJECT_JAVA_ARTIFACT_ID
+2+| *java.groupId*
+| jreleaser.project.java.group.id           | JRELEASER_PROJECT_JAVA_GROUP_ID
+2+| *java.multiProject*
+| jreleaser.project.java.multi.project     | JRELEASER_PROJECT_JAVA_MULTI_PROJECT
 |===
 
 == License URL