Platinum skills are no longer saved as permanent granted skills - Fixes bugreport:7466
->Updated the docs with more information on flag 4 skills
Please remember to run the SQL upgrade file to fix your skill tables

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@17256 54d463be-8e91-2dee-dedb-b68131a5f0ec