user docs: Rename require-topics.md.

templates/zerver/help/include/sidebar.md

@@ -129,7 +129,7 @@
 * [Restrict name and email changes](/help/restrict-name-and-email-changes)
 * [Disable message edit history](/help/disable-message-edit-history)
 * [Manage editing of old messages](/help/configure-message-editing-and-deletion)
-* [Require topics in stream messages](/help/require-users-to-include-topics-in-stream-messages)
+* [Require topics in stream messages](/help/require-topics)
 * [Add custom emoji](/help/add-custom-emoji)
 * [Configure authentication methods](/help/configure-authentication-methods)
 * [Add a custom linkification filter](/help/add-a-custom-linkification-filter)

templates/zerver/help/require-topics.md

@@ -0,0 +1,16 @@
+# Require topics in stream messages
+
+{!admin-only.md!}
+
+By default, users are not required to specify a topic in stream messages; if
+a user sends a message without a topic, the message's topic is displayed as
+**(no topic)**.  Any other user can then edit the topic of such a message to
+set a topic.
+
+You can instead choose to require a topic for new stream messages.
+
+{settings_tab|organization-settings}
+
+2. Under **Message feed**, select **Require topics in messages to streams**.
+
+{!save-changes.md!}

templates/zerver/help/require-users-to-include-topics-in-stream-messages.md

@@ -1,16 +0,0 @@
-# Require topics in stream messages
-
-{!admin-only.md!}
-
-By default, users are not required to specify the topics of messages
-to streams; if a user sends a message without a topic, the message's
-topic is displayed as **(no topic)**.  Any other user can then edit
-the topic of such a message to set a topic.
-
-Organization administrators can choose to require a topic for new messages.
-
-{settings_tab|organization-settings}
-
-2. Under **Message feed**, select **Require topics in messages to streams**.
-
-{!save-changes.md!}