HADOOP-18601. Fix build failure with docs profile. (#5331)

Reviewed-by: Steve Loughran <stevel@apache.org>

hadoop-hdfs-project/hadoop-hdfs/pom.xml

@@ -152,6 +152,10 @@ https://maven.apache.org/xsd/maven-4.0.0.xsd">
           <groupId>xml-apis</groupId>
           <artifactId>xml-apis</artifactId>
         </exclusion>
+        <exclusion>
+          <groupId>xerces</groupId>
+          <artifactId>xercesImpl</artifactId>
+        </exclusion>
       </exclusions>
     </dependency>
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-documentstore/pom.xml

@@ -122,6 +122,10 @@
           <groupId>io.netty</groupId>
           <artifactId>netty-handler-proxy</artifactId>
         </exclusion>
+        <exclusion>
+          <groupId>xml-apis</groupId>
+          <artifactId>xml-apis</artifactId>
+        </exclusion>
       </exclusions>
     </dependency>
   </dependencies>