Fix bug #3502 (clicking some links in Quick Docs doesn't work) - Don't use
event.target since that might point to a child of the link tag, e.g. in
this case a `<b>`.

Fix same bug in the other places we have similar logic, although so far
they haven't hit this problem.
Merge pull request #3557 from adobe/pflynn/docs-link-fix

Fix bug #3502 (clicking some links in Quick Docs doesn't work)