Mention local Secrets

Author: Ketasaja

content/en-us/reference/engine/classes/HttpService.yaml

@@ -155,6 +155,10 @@ methods:
       domain name to `*`. You can also limit the URL to a specific domain name
       such as `apis.myservice.com` or to subdomains of a domain, for example
       `*.myservice.org`.
+
+      Production `Datatype.Secrett`s are only available in live servers and Team Create. Local `Datatype.Secret`s are stored on your device per-experience, and are available for non-Team Create Studio. To add a local `Datatype.Secret` in Studio, go to the **Game Settings** in the **Home** tab of the ribbon bar. Then go to the **Security** tab of **Game Settings**.
+
+      Enter `Datatype.Secret`s in the JSON form `{"secret_name": ["cGFzc3dvcmQ=", "*.google.com"], "other_secret": ["cGFzc3dvcmQ=", "*.github.com"]}`, where `cGFzc3dvcmQ=` is the secret value, and `*.google.com` is the domain the secret is valid for. Secret values must be encoded in Base64.
     code_samples: []
     parameters:
       - name: key