Document that onFailure() for REST calls from plugin is never invoked

A change to show case this problem was pushed for the cookbook plugin
[1].

[1] https://gerrit-review.googlesource.com/#/c/68850

Change-Id: I17abca24018c4512025abbcb0c691da9bd18c4f6
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
1 file changed