Merge changes I9f382dab,I97225d4b,Iad113f44

* changes:
  Fix doxygen links in log.h.
  Fix docs for __android_log_is_loggable.
  Fix doxygen comments for __android_log_message.
tree: e943fed5815595887643b5b533d3cbfbdcdf2b70
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/