Clarify suspension-related features re: AUTHORIZED_FETCH (#1805)

* clarify suspension features, explain use of AUTHORIZED_FETCH #915

* Apply feedback from original

* re-rebase

* Relative links

* Instance -> Server

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Co-authored-by: bpmpyre <[email protected]>

Author: mjankowski

content/en/admin/moderation.md

@@ -45,6 +45,8 @@ Once the data has been deleted, whether that is after the 30-day period, or if a
 
 For remote accounts, suspending will make them unfollow any local account. Those relationships are not restored in case the remote account is unsuspended, even within the 30-day time window.
 
+Note that by default, users suspended by a server will still be able to view posts from that server. To change this default behavior, server admins can set the `AUTHORIZED_FETCH` environment variable - see the documentation for [configuring your environment](../config/).
+
 ## Moderating entire websites {#server-wide-moderation}
 
 Because individually moderating a large volume of users from a misbehaving server can be exhausting, it is possible to pre-emptively moderate against all users from that particular server using a so-called **domain block**, which comes with several different levels of severity. Go to **Preferences** > **Moderation** > **Federation**, then click "Add new domain block" to block a server.
@@ -71,6 +73,8 @@ After you have downloaded a blocklist, go to **Preferences** > **Moderation**
 
 You can also click "Export" to backup your Mastodon server's blocklist or share it with other administrators.
 
+Note that by default, users of a suspended server will still be able to view posts from the suspending server. To change this default behavior, server admins can set the `AUTHORIZED_FETCH` environment variable - see the documentation for [configuring your environment](../config/).
+
 ## Spam-fighting measures {#spam-fighting-measures}
 
 There are a few baseline measures for preventing spam in Mastodon: