[libqb] [ClusterLabs/libqb] 60122a: doc: clarify thread-safety (or not) in IPC doc

[Christine Caulfield]

Branch: refs/heads/master
  Home:   https://github.com/ClusterLabs/libqb
  Commit: 60122a4a4e8f7be233e08eac24a0a72e1a8d62bf
      https://github.com/ClusterLabs/libqb/commit/60122a4a4e8f7be233e08eac24a0a72e...
  Author: Christine Caulfield 
  Date:   2017-03-24 (Fri, 24 Mar 2017)

Changed paths:
    M docs/mainpage.h

Log Message:
  -----------
  doc: clarify thread-safety (or not) in IPC doc

Signed-off-by: Christine Caulfield