Add a Solr doc section specific to DSE
Add a Solr doc section specific to DSE

This commit fills the formerly-empty DSE Search section under the Solr
doc chapter.  The steps were tested on DSE 4.5.2 and a 0.5.1-SNAPSHOT
version shortly before 0.5.1 went final.
(cherry picked from commit c7ed2ae963fc615c8d2cf867ce9277f3faa422a8)

englishtown/titan,dylanht/titan,elubow/titan,mbrukman/titan,samanalysis/titan,samanalysis/titan,pluradj/titan,elubow/titan,CYPP/titan,graben1437/titan,CYPP/titan,elubow/titan,CYPP/titan,banjiewen/titan,dylanht/titan,amcp/titan,englishtown/titan,elubow/titan,graben1437/titan,CYPP/titan,thinkaurelius/titan,banjiewen/titan,amcp/titan,pluradj/titan,thinkaurelius/titan,amcp/titan,thinkaurelius/titan,mbrukman/titan,amcp/titan,banjiewen/titan,dylanht/titan,mbrukman/titan,pluradj/titan,englishtown/titan,samanalysis/titan,graben1437/titan,mbrukman/titan,pluradj/titan,graben1437/titan,thinkaurelius/titan,banjiewen/titan,mbrukman/titan,samanalysis/titan,dylanht/titan,englishtown/titan