Minor documentation updates.

git-svn-id: http://lufa-lib.googlecode.com/svn@2600 d5102386-fcda-11dd-9fdb-3debd5008f28
Commit for the LUFA-130303 release.

git-svn-id: http://lufa-lib.googlecode.com/svn@2601 d5102386-fcda-11dd-9fdb-3debd5008f28