Change cookbook to map target_arch to target_cpu

Change cookbook to map target_arch to target_cpu

target_arch was listed as the gn equivalent of target_arch. This is
wrong.

BUG=570145
Committed: https://crrev.com/ff69eea6e2d53fab7acf55b3eb8cd554789feda2
Cr-Commit-Position: refs/heads/master@{#367912}

[brucedawson, 2016-01-06 19:47:49]

brucedawson@chromium.org changed reviewers:
+ brettw@chromium.org

[brucedawson, 2016-01-06 19:47:50]

Minor doc fix - PTAL.

[brettw, 2016-01-06 20:06:38]

lgtm

[brucedawson, 2016-01-06 20:39:29]

The CQ bit was checked by brucedawson@chromium.org

[commit-bot: I haz the power, 2016-01-06 20:40:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1568623002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1568623002/1

[commit-bot: I haz the power, 2016-01-06 21:19:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-06 21:20:36]

Description was changed from

==========
Change cookbook to map target_arch to target_cpu

target_arch was listed as the gn equivalent of target_arch. This is
wrong.

BUG=570145
==========

to

==========
Change cookbook to map target_arch to target_cpu

target_arch was listed as the gn equivalent of target_arch. This is
wrong.

BUG=570145

Committed: https://crrev.com/ff69eea6e2d53fab7acf55b3eb8cd554789feda2
Cr-Commit-Position: refs/heads/master@{#367912}
==========

[commit-bot: I haz the power, 2016-01-06 21:20:37]

Patchset 1 (id:??) landed as
https://crrev.com/ff69eea6e2d53fab7acf55b3eb8cd554789feda2
Cr-Commit-Position: refs/heads/master@{#367912}