Mention the REST endpoint to set config parameters in the config FAQs
Mention the REST endpoint to set config parameters in the config FAQs

Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>
Change-Id: I605475bf1c7826e9eb888f2c5973d16f058a1ca5

GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners