Allow documenting Runtime exceptions

Change-Id: Ie76aafe61091d7514330ce0f5a9eaf245a014660
diff --git a/conf/checkstyle/sun_checks.xml b/conf/checkstyle/sun_checks.xml
index b2011e4..544ab72 100644
--- a/conf/checkstyle/sun_checks.xml
+++ b/conf/checkstyle/sun_checks.xml
@@ -116,6 +116,7 @@
         <!-- See http://checkstyle.sf.net/config_javadoc.html -->
         <module name="JavadocMethod">
             <property name="severity" value="warning"/>
+            <property name="allowUndeclaredRTE" value="true"/>
         </module>
         <module name="JavadocType">
             <property name="severity" value="warning"/>