add v2 query examples

add v2 query curl examples to doc and fix a spelling mistake.

Change-Id: Ide0bae84c3fadfdb5c4c0c40b7f47aa174e46f43
Adpated to nova's gettext changes.

Resolve the failure of nova_notifier unit test due to the gettext
changes in nova.

This is part of the blueprint gettext-i18n-issue.

Change-Id: Ie3fcbbe9f3c902c2c40c0d3c22bb2f999bb04006
Merge "add v2 query examples"