[DOC] Update import layout suggestion

Otherwise, the old layout would fail checkstyle against jakarta imports.
diff --git a/src/site/xdoc/server/dev-build.xml b/src/site/xdoc/server/dev-build.xml
index d29ac6a..1844903 100644
--- a/src/site/xdoc/server/dev-build.xml
+++ b/src/site/xdoc/server/dev-build.xml
@@ -144,6 +144,8 @@
                         blank line <br/>
                         import java.* <br/>
                         blank line <br/>
+                        import jakarta.* <br/>
+                        blank line <br/>
                         import javax.* <br/>
                         blank line <br/>
                         import org.* <br/>