[Docs] adding link to closure tags

[Docs] adding link to closure tags

This CL adds a direct link to the closure tags in the docs for Closure.  I'm new to Closure and I this was something I wanted a link to sooner.  Having a direct link here may help future-new-users.

BUG=

Committed: https://crrev.com/63043614507d3d7afdd9caf90f54013663333277
Cr-Commit-Position: refs/heads/master@{#350110}

[dschuyler, 2015-09-21 23:02:02]

dschuyler@chromium.org changed reviewers:
+ andybons@chromium.org

[Bons, 2015-09-22 02:45:35]

lgtm

[dschuyler, 2015-09-22 05:05:41]

The CQ bit was checked by dschuyler@chromium.org

[commit-bot: I haz the power, 2015-09-22 05:05:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1358903002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1358903002/1

[commit-bot: I haz the power, 2015-09-22 05:10:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-22 05:11:10]

Patchset 1 (id:??) landed as
https://crrev.com/63043614507d3d7afdd9caf90f54013663333277
Cr-Commit-Position: refs/heads/master@{#350110}