[PR] [MNGSITE-549] - fixed automatically check example [maven-site]

[via GitHub]

yuhaowin opened a new pull request, #596:
URL: https://github.com/apache/maven-site/pull/596

   JIRA issue: 
[MNGSITE-549](https://issues.apache.org/jira/projects/MNGSITE/issues/MNGSITE-549)
   
   fixed automatically check example:
   ```xml
       <pluginRepositories>
           <pluginRepository>
               <id>apache.snapshots</id>
               <url>https://repository.apache.org/snapshots/</url>
               <snapshots>
                   <enabled>true</enabled>
                   <updatePolicy>interval:15</updatePolicy>
               </snapshots>
           </pluginRepository>
       </pluginRepositories>
   ```


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