updating character limit for TA4H

Author: aahill

articles/cognitive-services/language-service/text-analytics-for-health/how-to/call-api.md

@@ -89,12 +89,14 @@ When using this feature asynchronously, the API results are available for 24 hou
 
 | Limit | Value |
 |------------------------|---------------|
-| Maximum size of a single document | 5,120 characters as measured by [StringInfo.LengthInTextElements](/dotnet/api/system.globalization.stringinfo.lengthintextelements). |
+| Maximum size of a single document | 30,720 characters as measured by [StringInfo.LengthInTextElements](/dotnet/api/system.globalization.stringinfo.lengthintextelements). |
 | Maximum size of entire request | 1 MB |
 | Max Documents Per Request | 10 for the web-based API, 1000 for the container. |
 
 If a document exceeds the character limit, the API won't process a document that exceeds the maximum size, and will return an invalid document error for it. If an API request has multiple documents, the API will continue processing them if they are within the character limit.
 
+When you send a document larger than 5,120 characters, it will be split by Text Analytics for health into chunks of 5,120 characters. If two entities are present on either side of a split that are related, the model will not be able to detect the relation.
+
 ### Rate limits
 
 Your rate limit will vary with your [pricing tier](https://aka.ms/unifiedLanguagePricing). These limits are the same for both versions of the API. These rate limits don't apply to the Text Analytics for health container, which does not have a set rate limit.

articles/cognitive-services/language-service/whats-new.md

@@ -38,6 +38,8 @@ Azure Cognitive Service for Language is updated on an ongoing basis. To stay up-
     > [!NOTE]
     > To use this [model version](sentiment-opinion-mining/how-to/call-api.md#specify-the-sentiment-analysis-model), you must specify it in your API calls, using the model version parameter. 
  
+* The character limit for Text Analytics for health has been increased from 5,120 to 30,720.
+
 ## Next steps
 
 * [What is Azure Cognitive Service for Language?](overview.md)