manually updates some of the demo docs and fixes some xref's (not done, but slightly better)
manually updates some of the demo docs and fixes some xref's (not done, but slightly better)

NightOwl888/lucenenet,jeme/lucenenet,jeme/lucenenet,NightOwl888/lucenenet,sisve/lucenenet,sisve/lucenenet,apache/lucenenet,apache/lucenenet,jeme/lucenenet,jeme/lucenenet,apache/lucenenet,NightOwl888/lucenenet,NightOwl888/lucenenet,apache/lucenenet