Fixing events doc link

I think they should go over. I'm actually reading these docs trying to learn more about sensu, so they may not be right.
Fixing event data link.
Merge pull request #119 from adamdecaf/patch-1

Fixing events doc link
[edits] external result input missing for 0.14, symlink 0.13 index partial
Merge pull request #145 from portertech/hotfix/edits

external result input missing for 0.14, symlink 0.13 index partial