Fix checkstyle issues

smack-experimental/src/main/java/org/jivesoftware/smackx/jet/JetManager.java

@@ -171,7 +171,7 @@ public final class JetManager extends Manager implements JingleDescriptionManage
     }
 
     /**
-     * Register an {@link JingleEnvelopeManager}
+     * Register an {@link JingleEnvelopeManager}.
      * @param method manager.
      */
     public void registerEnvelopeManager(JingleEnvelopeManager method) {
@@ -179,7 +179,7 @@ public final class JetManager extends Manager implements JingleDescriptionManage
     }
 
     /**
-     * Unregister an {@link JingleEnvelopeManager}
+     * Unregister an {@link JingleEnvelopeManager}.
      * @param namespace namespace of the manager.
      */
     public void unregisterEnvelopeManager(String namespace) {

smack-experimental/src/main/java/org/jivesoftware/smackx/jet/component/package-info.java

@@ -16,8 +16,8 @@
  */
 
 /**
- * Smack's API for XEP-XXXX: Jingle Encrypted Transports
- * @see <a href="https://geekplace.eu/xeps/xep-jet/xep-jet.html">Proto-XEP</a>
+ * Smack's API for XEP-XXXX: Jingle Encrypted Transports.
+ * @see <a href="https://geekplace.eu/xeps/xep-jet/xep-jet.html">Proto-XEP</a>.
  * Internal classes.
  */
 package org.jivesoftware.smackx.jet.component;

smack-experimental/src/main/java/org/jivesoftware/smackx/jet/element/package-info.java

@@ -16,8 +16,8 @@
  */
 
 /**
- * Smack's API for XEP-XXXX: Jingle Encrypted Transports
- * @see <a href="https://geekplace.eu/xeps/xep-jet/xep-jet.html">Proto-XEP</a>
+ * Smack's API for XEP-XXXX: Jingle Encrypted Transports.
+ * @see <a href="https://geekplace.eu/xeps/xep-jet/xep-jet.html">Proto-XEP</a>.
  * Elements.
  */
 package org.jivesoftware.smackx.jet.element;