Add the user agent content into the docs repo.

Add the user agent content into the docs repo.

Original content: https://developer.chrome.com/multidevice/user-agent

Also, fixed some typos in opening_links.md.

TBR=pkl@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2778973002
Cr-Commit-Position: refs/heads/master@{#460051}
Committed: https://chromium.googlesource.com/chromium/src/+/00a6d2f940c4f667933a016aa04e3835fad9e940

[jif, 2017-03-28 09:10:04]

jif@chromium.org changed reviewers:
+ jif@chromium.org

[jif, 2017-03-28 09:10:04]

The CQ bit was checked by jif@chromium.org

[jif, 2017-03-28 09:10:05]

lgtm

[commit-bot: I haz the power, 2017-03-28 09:10:16]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-28 09:30:16]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490692204771470, "parent_rev":
"184961b20d7bb0167de6eb29c5bc74180e3cc562", "commit_rev":
"00a6d2f940c4f667933a016aa04e3835fad9e940"}

[commit-bot: I haz the power, 2017-03-28 09:31:29]

Description was changed from

==========
Add the user agent content into the docs repo.

Original content: https://developer.chrome.com/multidevice/user-agent

Also, fixed some typos in opening_links.md.

TBR=pkl@chromium.org
BUG=
==========

to

==========
Add the user agent content into the docs repo.

Original content: https://developer.chrome.com/multidevice/user-agent

Also, fixed some typos in opening_links.md.

TBR=pkl@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2778973002
Cr-Commit-Position: refs/heads/master@{#460051}
Committed:
https://chromium.googlesource.com/chromium/src/+/00a6d2f940c4f667933a016aa04e...
==========

[commit-bot: I haz the power, 2017-03-28 09:31:31]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/00a6d2f940c4f667933a016aa04e...