* Align comments into 80 columns

* Align comments into 80 columns
* Stop using full pathnames (we don't know where the source could be)
* Use only relative distance to the source, so a user can download the code and
  generate their own copy of the doxygen documentation easily
* Since `docs' has moved one level up, all relative path names lost a `..'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9213 91177308-0d34-0410-b5e6-96231b3b80d8