Fix some JavaDoc warnings.

plugin/src/main/java/io/jenkins/plugins/forensics/git/miner/package-info.java

@@ -5,9 +5,11 @@
  * collect a statistical summary for all containing commits. This includes the commits count, the changed files count,
  * and the added and deleted lines in those commits.
  * </p>
+ *
  * <p>
  * Additionally, the classes in this package will collect commit statistics for all repository files in the style of
  * the book "Code as a Crime Scene":
+ * </p>
  * <ul>
  *     <li> commits count </li>
  *     <li> different authors count </li>

plugin/src/test/java/io/jenkins/plugins/forensics/git/miner/DiffsCollectorITest.java

@@ -22,6 +22,7 @@
  *
  * @author Ullrich Hafner
  */
+@SuppressWarnings("checkstyle:LambdaBodyLength")
 public class DiffsCollectorITest extends GitITest {
     private static final String MOVED_FILE = "moved";
     private static final String AUTHOR = "author";

plugin/src/test/java/io/jenkins/plugins/forensics/git/reference/GitReferenceRecorderTest.java

@@ -58,7 +58,6 @@ void shouldFillModel() {
 
             Descriptor descriptor = new Descriptor(jenkins, model);
 
-
             FreeStyleProject project = mock(FreeStyleProject.class);
             assertThat(descriptor.doFillReferenceJobItems(project)).isEqualTo(new ComboBoxModel());
             verifyNoInteractions(model);