Re-enable javadoc links to Logback

- javadoc links to Logback were not working anymore when generation javadoc with JDK8. Now that we switched to JDK 17, these links can be re-enabled.
- disable javadoc warnings about “missing javadoc comments” on public/protected methods and fields

pom.xml

@@ -553,25 +553,15 @@
  <configuration>
  <!-- Enable all validation checks except "accessibility"
  -->
- <doclint>all,-accessibility</doclint>
+ <doclint>all,-missing,-accessibility</doclint>
 
  <!-- Setup links to external api docs
  -->
- <links>
- <!-- Javadoc generation fails under Java8 because the Logback javadoc does not contain a
- "package-list" index file anymore since version 1.3.0. It seems to work however with
- Java 9 and 11.
- 
- Note: "package-list" has been replaced by "element-list" in Java 9... Newer jdk versions
- seem to look for "element-list" first and fallback to "package-list".
- 
- A possible workaround is to build the project (and generate javadoc) using Java 9 instead
- of 8. In the meantime links to Logback apidoc are commented.
- 
+ <links> 
  <link>https://javadoc.io/doc/ch.qos.logback/logback-core/${logback.version}</link>
  <link>https://javadoc.io/doc/ch.qos.logback/logback-classic/${logback.version}</link>
  <link>https://javadoc.io/doc/ch.qos.logback/logback-access/${logback.version}</link>
- -->
+
  <link>https://javadoc.io/doc/com.fasterxml.jackson.core/jackson-core/${jackson.version}</link>
  <link>https://javadoc.io/doc/com.fasterxml.jackson.core/jackson-databind/${jackson.version}</link>
  </links>

src/main/java/net/logstash/logback/appender/destination/DestinationParser.java

@@ -55,7 +55,6 @@ private DestinationParser() {
  * <p>
  *
  * For example, "host1.domain.com,host2.domain.com:5560"
- * <p>
  *
  * @param destinations comma-separated list of destinations in the form of {@code hostName[:portNumber]}
  * @param defaultPort the port number to use when a destination does not specify one explicitly