help: Update "Reading private messages" -> "Reading direct messages".

- Updates page content and page name in the sidebar index.
- Updates include blocks.

help/getting-started-with-zulip.md

@@ -36,7 +36,7 @@ Like your email inbox, Zulip works best if you read it topic-by-topic.
 
 ### Reading private messages
 
-{!reading-pms.md!}
+{!reading-dms.md!}
 
 ## Sending messages
 
@@ -63,4 +63,3 @@ Like your email inbox, Zulip works best if you read it topic-by-topic.
 ## Related articles
 
 * [Setting up your organization](/help/getting-your-organization-started-with-zulip)
-

help/include/reading-dms.md

@@ -1,9 +1,9 @@
 {start_tabs}
 
-1. If the **Private messages** section in the left sidebar is collapsed, click
+1. If the **Direct messages** section in the left sidebar is collapsed, click
    on it to expand it.
 
-1. Click on a conversation under **Private messages**.
+1. Click on a conversation under **Direct messages**.
 
 1. Read the conversation, scrolling down with the mouse or by pressing
    <kbd>PgDn</kbd>.
@@ -16,12 +16,12 @@
 1. Click on the next conversation in the left sidebar, or use the
    <kbd>P</kbd> key to go to the next unread conversation.
 
-1. To view all your private message conversations, click the **more
-   conversations** link at the bottom of the **Private messages** section.
+1. To view all your direct message conversations, click the **more
+   conversations** link at the bottom of the **Direct messages** section.
 
 !!! tip ""
 
-    You can also find recent PMs in the [**Recent
-    conversations**](/help/recent-conversations) tab by selecting the **Include PMs** option.
+    You can also find recent DMs in the [**Recent
+    conversations**](/help/recent-conversations) tab by selecting the **Include DMs** option.
 
 {end_tabs}

help/reading-dms.md

@@ -1,6 +1,6 @@
-# Reading private messages (PMs)
+# Reading direct messages (DMs)
 
-{!reading-pms.md!}
+{!reading-dms.md!}
 
 ## Related articles