Prompt/Workspace.hs: suggest using defaultXPConfig in usage doc.
Prompt/Workspace.hs: suggest using defaultXPConfig in usage doc.

darcs-hash:20071117230940-928c4-8863f76809c6d77f95a3730ddfbd73280cf72a29

jthornber/XMonadContrib,jthornber/XMonadContrib