Javadoc: ignore missing tags

Change-Id: I7d503e8796b101e2f312e286bfb58ab65e8a0bb8

pom.xml

diff --git a/pom.xml b/pom.xml
index a972cab..e570a9d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -418,6 +418,7 @@
         <configuration>
           <encoding>UTF-8</encoding>
           <quiet>true</quiet>
+          <additionalparam>-Xdoclint:-missing</additionalparam>
           <links>
             <link>http://docs.oracle.com/javase/8/docs/api</link>
           </links>