help: Make minor edits and style updates to the Sending Messages section.

templates/zerver/help/enable-enter-to-send.md

@@ -7,10 +7,16 @@ This is convenient for typing multi-line messages, which are more common in
 Zulip than in most other chat products. However, you can also configure
 Zulip so that `Enter` sends the message.
 
+### Enable Enter to send
+
+{start_tabs}
+
 {!start-composing.md!}
 
 1. Click **Press Enter to send** at the bottom of the compose box.
 
+{end_tabs}
+
 Note that `Shift+Enter` always adds a new line, regardless of whether
 **Enter to send** is enabled. The full table is below.
 

templates/zerver/help/message-a-stream-by-email.md

@@ -4,6 +4,8 @@ This can be useful if you want to copy an email into Zulip. If you're
 planning on doing this in an automated way, consider using our
 [send message API](/api/send-message).
 
+{start_tabs}
+
 {relative|stream|subscribed}
 
 1. Select a stream.
@@ -12,6 +14,8 @@ planning on doing this in an automated way, consider using our
 
 1. Send an email to that email address.
 
+{end_tabs}
+
 The email subject will become the Zulip topic, and the email body will
 become the Zulip message.
 

templates/zerver/help/preview-your-message-before-sending.md

@@ -1,7 +1,13 @@
 # Preview your message before sending
 
+{start_tabs}
+
 {!start-composing.md!}
 
+1. Write a message.
+
 1. Click the **eye** (<i class="fa fa-eye"></i>) icon at the bottom of the compose box.
 
+{end_tabs}
+
 Click the **pencil and paper** (<i class="fa fa-edit"></i>) icon to resume editing.

templates/zerver/help/start-a-call.md

@@ -1,5 +1,7 @@
 # Start a video call
 
+{start_tabs}
+
 {!start-composing.md!}
 
 2. Click the video-camera (<i class="fa fa-video-camera"></i>) icon in the
@@ -11,5 +13,7 @@ compose box.
 
 5. Click on the link in the message to start or join the call.
 
+{end_tabs}
+
 !!! tip ""
     You can replace **Click to join video call** with anything you want.

templates/zerver/help/verify-your-message-was-successfully-sent.md

@@ -31,4 +31,4 @@ If you do see the red icons, you can either
   to attempt a resend.
 * Click **cancel** (<i class="fa fa-times-circle" style="color: red;"></i>)
   to delete the message.
-* Reload the page to cancel all messages with the red icons.
+* Reload the page to cancel all the messages with red icons.