[polari] help: Update string reference

[Florian Müllner <fmuellner src gnome org>]

commit 8dc9544b2219f90fcf12d3db56312a5faeec5db0
Author: Sabri Ünal <libreajans gmail com>
Date:   Mon Mar 22 01:57:11 2021 +0300

    help: Update string reference
    
    The GUI changed "Message" to "Start Conversation" a while ago,
    update the documentation to reflect that.
    
    https://gitlab.gnome.org/GNOME/polari/-/merge_requests/180

 help/C/irc-start-conversation.page | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/help/C/irc-start-conversation.page b/help/C/irc-start-conversation.page
index 65725fed..e08e95a4 100644
--- a/help/C/irc-start-conversation.page
+++ b/help/C/irc-start-conversation.page
@@ -34,7 +34,7 @@
     </item>
     <item>
       <p>Information about the user, including their name and the last time they
-      were active in the channel, will appear.  Click <gui>Message</gui> to 
+      were active in the channel, will appear. Click <gui>Start Conversation</gui> to
       start a private conversation.
       </p>
     </item>
@@ -55,7 +55,7 @@
       the channel, will appear.</p>
     </item>
     <item>
-      <p>Press <gui>Message</gui> to start a private conversation.</p>
+      <p>Press <gui>Start Conversation</gui> to start a private conversation.</p>
     </item>
   </steps>