fix links (Azure#17139)

Author: maririos

sdk/formrecognizer/Azure.AI.FormRecognizer/samples/README.md

@@ -23,7 +23,7 @@ Azure Cognitive Services Form Recognizer is a cloud service that uses machine le
 - [Recognize custom forms](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/formrecognizer/Azure.AI.FormRecognizer/samples/Sample2_RecognizeCustomForms.md)
 - [Recognize receipts](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/formrecognizer/Azure.AI.FormRecognizer/samples/Sample3_RecognizeReceipts.md)
 - [Recognize business cards](https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/formrecognizer/Azure.AI.FormRecognizer/samples/Sample9_RecognizeBusinessCards.md)
-<!--- [Recognize invoices](https://github.com/Azure/azure-sdk-for-net/blob/feature/formrecognizer2.1/sdk/formrecognizer/Azure.AI.FormRecognizer/samples/Sample10_RecognizeInvoices.md)-->
+- [Recognize invoices](https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/formrecognizer/Azure.AI.FormRecognizer/samples/Sample10_RecognizeInvoices.md)
 - [Train a model](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/formrecognizer/Azure.AI.FormRecognizer/samples/Sample5_TrainModel.md)
 - [Manage custom models](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/formrecognizer/Azure.AI.FormRecognizer/samples/Sample6_ManageCustomModels.md)
 

sdk/formrecognizer/Azure.AI.FormRecognizer/samples/Sample10_RecognizeInvoices.md

@@ -171,8 +171,8 @@ using (FileStream stream = new FileStream(invoicePath, FileMode.Open))
 
 To see the full example source files, see:
 
-* [Recognize invoices from URI](https://github.com/Azure/azure-sdk-for-net/blob/feature/formrecognizer2.1/sdk/formrecognizer/Azure.AI.FormRecognizer/tests/samples/Sample13_RecognizeInvoicesFromUri.cs)
-* [Recognize invoices from file](https://github.com/Azure/azure-sdk-for-net/blob/feature/formrecognizer2.1/sdk/formrecognizer/Azure.AI.FormRecognizer/tests/samples/Sample13_RecognizeInvoicesFromFile.cs)
+* [Recognize invoices from URI](https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/formrecognizer/Azure.AI.FormRecognizer/tests/samples/Sample13_RecognizeInvoicesFromUri.cs)
+* [Recognize invoices from file](https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/formrecognizer/Azure.AI.FormRecognizer/tests/samples/Sample13_RecognizeInvoicesFromFile.cs)
 
 [README]: https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/formrecognizer/Azure.AI.FormRecognizer#getting-started
 [strongly_typing_a_recognized_form]: https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/formrecognizer/Azure.AI.FormRecognizer/samples/Sample4_StronglyTypingARecognizedForm.md