Properly use + or : for the book symbol in full command help (??) as well

as in tutorial mode.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6241 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 29, 2008
APK7MEJ3GCLRVRRKQUAYYUWV2LGJXJCNCXL5AOB7OOXRQNALTVWAC
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