help: Clarify that paid Cloud features are available on Plus too.

help/export-your-organization.md

@@ -22,9 +22,9 @@ to all Zulip Cloud organizations:
   exported.
 
 Two additional types of data exports are available to **corporate** [Zulip Cloud
-Standard][standard] customers:
+Standard][plans] and [Zulip Cloud Plus][plans] customers:
 
-[standard]: https://zulip.com/plans/
+[plans]: https://zulip.com/plans/
 
 * [**Full export without member consent**](#full-export-without-member-consent):
   All the data in the organization.

help/include/add-a-wide-logo.md

@@ -1,4 +1,4 @@
-{!cloud-standard-only.md!}
+{!cloud-paid-plans-only.md!}
 
 You can customize the logo users see in the top left corner
 of the Zulip app. For best results:

help/include/cloud-paid-plans-only.md

@@ -0,0 +1,5 @@
+!!! warn ""
+
+    Zulip Cloud customers who wish to use this feature must upgrade to
+    [Zulip Cloud Standard](https://zulip.com/plans/) or [Zulip Cloud
+    Plus](https://zulip.com/plans/).

help/include/cloud-standard-only.md

@@ -1,3 +0,0 @@
-!!! warn ""
-
-    This feature is only available to Zulip Cloud Standard and self-hosted organizations.

help/include/export-without-consent-requirements.md

@@ -1,7 +1,8 @@
 To perform this export, your organization must meet the following requirements:
 
-- You are a paid [Zulip Cloud Standard][standard] customer. In rare cases,
-  exceptions may be made in case of due legal process.
+- You are a paid [Zulip Cloud Standard](https://zulip.com/plans/) or [Zulip
+  Cloud Plus](https://zulip.com/plans/) customer. In rare cases, exceptions may
+  be made in case of due legal process.
 
 - You have authority to read members' [direct messages](/help/direct-messages).
   Typically, this will be because your Zulip organization is administered by a