docs: update description of updateLog / autoCommit in solrconfig
docs: update description of updateLog / autoCommit in solrconfig

git-svn-id: 308d55f399f3bd9aa0560a10e81a003040006c48@1433817 13f79535-47bb-0310-9956-ffa450edef68

apache/solr,apache/solr,apache/solr,apache/solr,apache/solr