[MM-57194_zoom]: Added note to copy secrets as they will not be visib…

…le again (#7419)

Co-authored-by: Raghav Aggarwal <raghav.aggarwal@brightscout.com>
Co-authored-by: Carrie Warner (Mattermost) <74422101+cwarnermm@users.noreply.github.com>

source/integrate/zoom-interoperability.rst

@@ -66,6 +66,10 @@ A Mattermost system admin must perform the following steps in Mattermost.
 
 Install the Zoom integration from the in-product App Marketplace:
 
+.. note::
+
+  We recommend making a copy of your webhook secret and encryption key, as it will only be visible to you once.
+
 1. In Mattermost, from the Product menu |product-list|, select **App Marketplace**.
 2. Search for or scroll to Zoom, and select **Install**.
 3. Once installed, select **Configure**. You'll be taken to the System Console.