updates AI Assistant chat sharing and related screenshots (#3110)

Fixes #2975 by updating screenshots for Security AI Assistant's
conversation sharing and configuration sections. Also adds a bit more
info about the value-add of conversation sharing.

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Co-authored-by: Mike Birnstiehl <[email protected]>

Author: benironside

solutions/images/ai-assistant-shared-status-badge.png

@@ -120,7 +120,7 @@ stack: ga 9.2
 serverless: ga
 ```
 
-Conversations that you start with AI Assistant are private by default and not visible to other members of your team. You have two ways to share conversations - either with selected members or more broadly to everyone with access to the space.
+Conversations that you start with AI Assistant are private by default and not visible to other members of your team. Sharing conversations can help you keep your teammates informed about your conversations with AI Assistant, making it easier to simultaneously collaborate with your teammates and AI Assistant. You have two ways to share conversations—either with selected members or more broadly to everyone with access to the space. 
 
 To share a conversation, do one of the following: