Update contents of 6.7-to-6.8 docs (!6807) · 合并请求 · 王权利 / large · 极狐GitLab

王权利请求将github/fork/robertd/upgrade-docs-6.7-6.8合并到master 4月 17, 2014

Created by: robertd

Update upgrade docs

@JobV please check if this looks good to you