fix whitespace

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1629139 13f79535-47bb-0310-9956-ffa450edef68
fix javadocs typo

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1629142 13f79535-47bb-0310-9956-ffa450edef68
do not accept null delegate in FilterLeafReader.Filter*

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1629152 13f79535-47bb-0310-9956-ffa450edef68
improve error reporting when this tool finds javadocs problems

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1629157 13f79535-47bb-0310-9956-ffa450edef68