Fix javadoc errors

acme4j-client/src/main/java/org/shredzone/acme4j/provider/AbstractAcmeClientProvider.java

@@ -32,7 +32,7 @@ import org.shredzone.acme4j.impl.GenericAcmeClient;
 
 /**
  * Abstract implementation of {@link AcmeClientProvider}. It consists of a challenge
- * registry and a standard {@link #openConnection(URI)} implementation.
+ * registry and a standard {@link HttpConnector}.
  * <p>
  * Implementing classes must implement at least {@link AcmeClientProvider#accepts(URI)}
  * and {@link AbstractAcmeClientProvider#resolve(URI)}.

acme4j-letsencrypt/src/test/java/org/shredzone/acme4j/provider/LetsEncryptHttpConnectorTest.java

@@ -36,8 +36,7 @@ import org.junit.experimental.categories.Category;
 public class LetsEncryptHttpConnectorTest {
 
     /**
-     * Test if the {@link LetsEncryptAcmeClientProvider#openConnection(URI)} accepts only
-     * the Let's Encrypt certificate.
+     * Test if the connector accepts only the Let's Encrypt certificate.
      * <p>
      * This test requires a network connection. It should be excluded from automated
      * builds.

acme4j-utils/src/test/java/org/shredzone/acme4j/util/CertificateUtilsTest.java

@@ -44,8 +44,9 @@ public class CertificateUtilsTest {
     }
 
     /**
-     * Test if {@link CertificateUtilsTest#writeX509CertificateTest()} writes a
-     * proper X.509 certificate.
+     * Test if
+     * {@link CertificateUtils#writeX509Certificate(X509Certificate, java.io.Writer)}
+     * writes a proper X.509 certificate.
      */
     @Test
     public void testWriteX509Certificate() throws IOException, CertificateException {