[formrecognizer] updating docs with aka.ms links (Azure#21012)

* add service links

* update with the aka.ms links

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

@@ -160,6 +160,7 @@ Use the `model` parameter to select the type of model for analysis.
 |"{custom-model-id}"| Text extraction, selection marks, tables, labeled fields and values from your custom documents
 
 Sample code snippets are provided to illustrate using a DocumentAnalysisClient [here](#examples "Examples").
+More information about analyzing documents, including supported features and locales can be found in the [service documentation][fr-models].
 
 ### DocumentModelAdministrationClient
 `DocumentModelAdministrationClient` provides operations for:
@@ -532,6 +533,7 @@ except ResourceNotFoundError:
 
 ### General
 Form Recognizer client library will raise exceptions defined in [Azure Core][azure_core_exceptions].
+Error codes and messages raised by the Form Recognizer service can be found in the [service documentation][fr-errors].
 
 ### Logging
 This library uses the standard
@@ -584,6 +586,8 @@ This project has adopted the [Microsoft Open Source Code of Conduct][code_of_con
 [fr-labeling-tool]: https://aka.ms/azsdk/formrecognizer/labelingtool
 [fr-build-model]: https://aka.ms/azsdk/formrecognizer/buildmodel
 [fr-build-training-set]: https://aka.ms/azsdk/formrecognizer/buildtrainingset
+[fr-models]: https://aka.ms/azsdk/formrecognizer/models
+[fr-errors]: https://aka.ms/azsdk/formrecognizer/errors
 
 [azure_core_ref_docs]: https://aka.ms/azsdk/python/core/docs
 [azure_core_exceptions]: https://aka.ms/azsdk/python/core/docs#module-azure.core.exceptions

sdk/formrecognizer/azure-ai-formrecognizer/azure/ai/formrecognizer/_document_analysis_client.py

@@ -78,9 +78,8 @@ def begin_analyze_document(self, model, document, **kwargs):
         """Analyze field text and semantic values from a given document.
 
         :param str model: A unique model identifier can be passed in as a string.
-            Use this to specify the custom model ID or prebuilt model ID. Prebuilt model IDs to use are:
-            "prebuilt-receipt", "prebuilt-invoice", "prebuilt-idDocument", "prebuilt-businessCard",
-            "prebuilt-document", "prebuilt-layout".
+            Use this to specify the custom model ID or prebuilt model ID. Prebuilt model IDs supported
+            can be found here: https://aka.ms/azsdk/formrecognizer/models
         :param document: JPEG, PNG, PDF, TIFF, or BMP type file stream or bytes.
         :type document: bytes or IO[bytes]
         :keyword str pages: Custom page numbers for multi-page documents(PDF/TIFF). Input the page numbers
@@ -134,9 +133,8 @@ def begin_analyze_document_from_url(self, model, document_url, **kwargs):
         The input must be the location (URL) of the document to be analyzed.
 
         :param str model: A unique model identifier can be passed in as a string.
-            Use this to specify the custom model ID or prebuilt model ID. Prebuilt model IDs to use are:
-            "prebuilt-receipt", "prebuilt-invoice", "prebuilt-idDocument", "prebuilt-businessCard",
-            "prebuilt-document", "prebuilt-layout".
+            Use this to specify the custom model ID or prebuilt model ID. Prebuilt model IDs supported
+            can be found here: https://aka.ms/azsdk/formrecognizer/models
         :param str document_url: The URL of the document to analyze. The input must be a valid, encoded, and
             publicly accessible URL of one of the supported formats: JPEG, PNG, PDF, TIFF, or BMP.
         :keyword str pages: Custom page numbers for multi-page documents(PDF/TIFF). Input the page numbers

sdk/formrecognizer/azure-ai-formrecognizer/azure/ai/formrecognizer/aio/_document_analysis_client_async.py

@@ -84,9 +84,8 @@ async def begin_analyze_document(
         """Analyze field text and semantic values from a given document.
 
         :param str model: A unique model identifier can be passed in as a string.
-            Use this to specify the custom model ID or prebuilt model ID. Prebuilt model IDs to use are:
-            "prebuilt-receipt", "prebuilt-invoice", "prebuilt-idDocument", "prebuilt-businessCard",
-            "prebuilt-document", "prebuilt-layout".
+            Use this to specify the custom model ID or prebuilt model ID. Prebuilt model IDs supported
+            can be found here: https://aka.ms/azsdk/formrecognizer/models
         :param document: JPEG, PNG, PDF, TIFF, or BMP type file stream or bytes.
         :type document: bytes or IO[bytes]
         :keyword str pages: Custom page numbers for multi-page documents(PDF/TIFF). Input the page numbers
@@ -141,9 +140,8 @@ async def begin_analyze_document_from_url(
         The input must be the location (URL) of the document to be analyzed.
 
         :param str model: A unique model identifier can be passed in as a string.
-            Use this to specify the custom model ID or prebuilt model ID. Prebuilt model IDs to use are:
-            "prebuilt-receipt", "prebuilt-invoice", "prebuilt-idDocument", "prebuilt-businessCard",
-            "prebuilt-document", "prebuilt-layout".
+            Use this to specify the custom model ID or prebuilt model ID. Prebuilt model IDs supported
+            can be found here: https://aka.ms/azsdk/formrecognizer/models
         :param str document_url: The URL of the document to analyze. The input must be a valid, encoded, and
             publicly accessible URL of one of the supported formats: JPEG, PNG, PDF, TIFF, or BMP.
         :keyword str pages: Custom page numbers for multi-page documents(PDF/TIFF). Input the page numbers