Updating options guide for tile_show_items.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8516 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on January 17, 2009
D4NSV7Q2MLREL2BXV4CB2IX7TBWLUEWBWHJCILB2HCGPRGCZANQQC
Change contents