docs: guardrail config's streamProcessingMode (#564)

Author: dlew

content/docs/configuration/librechat_yaml/object_structure/aws_bedrock.mdx

@@ -19,6 +19,7 @@ endpoints:
       guardrailIdentifier: "your-guardrail-id"
       guardrailVersion: "1"
       trace: "enabled"
+      streamProcessingMode: "sync"
 ```
 
 > **Note:** AWS Bedrock endpoint supports all [Shared Endpoint Settings](/docs/configuration/librechat_yaml/object_structure/shared_endpoint_settings), including `streamRate`, `titleModel`, `titleMethod`, `titlePrompt`, `titlePromptTemplate`, and `titleEndpoint`. The settings shown below are specific to Bedrock or have Bedrock-specific defaults.
@@ -148,6 +149,7 @@ endpoints:
     ['guardrailIdentifier', 'String', 'The unique identifier of the guardrail to apply.', 'Required when using guardrails.'],
     ['guardrailVersion', 'String', 'The version of the guardrail to use.', 'Required when using guardrails.'],
     ['trace', 'String', 'Controls guardrail trace output for debugging. Options: "enabled", "enabled_full", or "disabled".', 'Optional. Default: "disabled"'],
+    ['streamProcessingMode', 'String', 'Controls guardrail stream processing mode. Options: "sync" or "async".', 'Optional. Default: "sync"'],
   ]}
 />
 
@@ -159,12 +161,14 @@ endpoints:
       guardrailIdentifier: "abc123xyz"
       guardrailVersion: "1"
       trace: "enabled"
+      streamProcessingMode: "sync"
 ```
 
 **Notes:**
 - Guardrails help ensure responsible AI usage by filtering harmful content, PII, and other sensitive information
 - The `guardrailIdentifier` can be found in the AWS Bedrock console under Guardrails
 - Set `trace` to `"enabled"` or `"enabled_full"` during development to see which guardrail policies are triggered
+- Set `streamProcessingMode` to `"async"` to stream responses faster (at the cost of guardrail possibly allowing inappropriate content through until its scan completes)
 - For production, set `trace` to `"disabled"` to reduce response payload size
 
 ## Notes

content/docs/configuration/pre_configured_ai/bedrock.mdx

@@ -64,6 +64,7 @@ endpoints:
       guardrailIdentifier: "abc123xyz"
       guardrailVersion: "1"
       trace: "enabled"
+      streamProcessingMode: "sync"
 ```
 
 - `streamRate`: (Optional) Set the rate of processing each new token in milliseconds.
@@ -81,6 +82,7 @@ endpoints:
     - `guardrailIdentifier`: The guardrail ID or ARN from your AWS Bedrock Console.
     - `guardrailVersion`: The guardrail version number (e.g., `"1"`) or `"DRAFT"`.
     - `trace`: (Optional) Enable trace logging: `"enabled"`, `"disabled"`, or `"enabled_full"`.
+    - `streamProcessingMode`: (Optional) Set stream processing mode: `"sync"` or `"async"` (defaults to `"sync"`).
     - See [AWS Bedrock Guardrails documentation](https://docs.aws.amazon.com/bedrock/latest/userguide/guardrails-how.html) for creating and managing guardrails.
 
 ## Inference Profiles