updating readmes for ta to include ext summarization (Azure#20094)

Author: kristapratico

sdk/textanalytics/azure-ai-textanalytics/README.md

@@ -10,6 +10,7 @@ Text Analytics is a cloud-based service that provides advanced natural language
 - Key Phrase Extraction
 - Multiple Analysis
 - Healthcare Entities Analysis
+- Extractive Text Summarization
 
 [Source code][source_code] | [Package (PyPI)][ta_pypi] | [API reference documentation][ta_ref_docs] | [Product documentation][ta_product_documentation] | [Samples][ta_samples]
 
@@ -504,7 +505,7 @@ Note: The Healthcare Entities Analysis service is available in API version v3.1
 - Linked Entity Recognition
 - Key Phrase Extraction
 - Sentiment Analysis
-- Extractive Summarization
+- Extractive Summarization (see sample [here][extract_summary_sample])
 
 ```python
 from azure.core.credentials import AzureKeyCredential
@@ -639,6 +640,7 @@ Common scenarios
 - Detect language: [sample_detect_language.py][detect_language_sample] ([async version][detect_language_sample_async])
 - Healthcare Entities Analysis: [sample_analyze_healthcare_entities.py][analyze_healthcare_entities_sample] ([async version][analyze_healthcare_entities_sample_async])
 - Multiple Analysis: [sample_analyze_actions.py][analyze_sample] ([async version][analyze_sample_async])
+- Extractive text summarization: [sample_extract_summary.py][extract_summary_sample] ([async version][extract_summary_sample_async])
 
 Advanced scenarios
 
@@ -734,6 +736,8 @@ This project has adopted the [Microsoft Open Source Code of Conduct][code_of_con
 [analyze_sample_async]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/async_samples/sample_analyze_actions_async.py
 [opinion_mining_sample]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/sample_analyze_sentiment_with_opinion_mining.py
 [opinion_mining_sample_async]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/async_samples/sample_analyze_sentiment_with_opinion_mining_async.py
+[extract_summary_sample]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/sample_extract_summary.py
+[extract_summary_sample_async]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/async_samples/sample_extract_summary_async.py
 [cla]: https://cla.microsoft.com
 [code_of_conduct]: https://opensource.microsoft.com/codeofconduct/
 [coc_faq]: https://opensource.microsoft.com/codeofconduct/faq/

sdk/textanalytics/azure-ai-textanalytics/samples/README.md

@@ -30,6 +30,7 @@ These sample programs show common scenarios for the Text Analytics client's offe
 |[sample_alternative_document_input.py][sample_alternative_document_input] and [sample_alternative_document_input_async.py][sample_alternative_document_input_async]|Pass documents to an endpoint using dicts|
 |[sample_analyze_healthcare_entities.py][analyze_healthcare_entities_sample] and [sample_analyze_healthcare_entities_async.py][analyze_healthcare_entities_sample_async]|Analyze healthcare entities|
 |[sample_analyze_actions.py][analyze_sample] and [sample_analyze_actions_async.py][analyze_sample_async]|Run multiple analyses together in a single request|
+|[sample_extract_summary.py][extract_summary_sample] and [sample_extract_summary_async.py][extract_summary_sample_async]|As part of the analyze API, run extractive text summarization on documents|
 
 ## Prerequisites
 * Python 2.7, or 3.6 or later is required to use this package (3.6 or later if using asyncio)
@@ -98,6 +99,8 @@ what you can do with the Azure Text Analytics client library.
 [analyze_sample_async]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/async_samples/sample_analyze_actions_async.py
 [sample_analyze_healthcare_entities_with_cancellation]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/sample_analyze_healthcare_entities_with_cancellation.py
 [sample_analyze_healthcare_entities_with_cancellation_async]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/async_samples/sample_analyze_healthcare_entities_with_cancellation_async.py
+[extract_summary_sample]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/sample_extract_summary.py
+[extract_summary_sample_async]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/async_samples/sample_extract_summary_async.py
 [pip]: https://pypi.org/project/pip/
 [azure_subscription]: https://azure.microsoft.com/free/
 [azure_text_analytics_account]: https://docs.microsoft.com/azure/cognitive-services/cognitive-services-apis-create-account?tabs=singleservice%2Cwindows