copy added for directions and architecture

Author: ilmarmur

docs/architecture.md

@@ -41,6 +41,8 @@ The solution uses a modular architecture with nested CloudFormation stacks to su
 - Pattern-specific optimizations and configurations
 - Optional features that can be enabled across all patterns:
   - Document summarization (controlled by `IsSummarizationEnabled` parameter)
+    - This feature also enables the "Chat with Document" functionality
+    - This feature does not use the Bedrock Knowledge Base but stores a full-text text file in S3
   - Document Knowledge Base (using Amazon Bedrock)
   - Automated accuracy evaluation against baseline data
 

docs/web-ui.md

@@ -102,6 +102,8 @@ The Document Process Flow visualization is particularly useful for troubleshooti
 
 The "Chat with Document" feature is available at the bottom of the Document Detail view. This feature uses the same model that's configured to do the summarization to provide a RAG interface to the document that's the details are displayed for. No other document is taken in to account except the document you're viewing the details of. Note that this feature will only work after the document status is marked as complete.
 
+Your chat history will be saved as you continue your chat. If you leave the page, your chat history is erased. This feature uses prompt caching for the document contents for repeated chat requests for each document.
+
 ### How to Use
 
 1. Navigate to a document's detail page and scroll to the bottom