1. Use doxygen format for Protocol/PPI data structure
2. Remove doxygen comments for function elements in Protocol/Ppi
3. Use doxygen format for data elements in Protocol/Ppi, and add missing comments where necessary
4. PEI Services Table is also updated accordingly.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6107 6f19259b-4bc3-4df7-8a09-765794883524