Clarified exceptions docs (Azure#14947)

Author: tasherif-msft

sdk/storage/azure-storage-blob/README.md

@@ -342,7 +342,8 @@ the client level to enable it for all requests.
 ## Troubleshooting
 ### General
 Storage Blob clients raise exceptions defined in [Azure Core](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/core/azure-core/README.md).
-All Blob service operations will throw a `StorageErrorException` on failure with helpful [error codes](https://docs.microsoft.com/rest/api/storageservices/blob-service-error-codes).
+
+This list can be used for reference to catch thrown exceptions. To get the specific error code of the exception, use the `error_code` attribute, i.e, `exception.error_code`.
 
 ### Logging
 This library uses the standard

sdk/storage/azure-storage-file-datalake/README.md

@@ -163,7 +163,7 @@ for path in paths:
 ### General
 DataLake Storage clients raise exceptions defined in [Azure Core](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/core/azure-core/README.md).
 
-All DataLake service operations will throw a StorageErrorException on failure with helpful [error codes](https://docs.microsoft.com/rest/api/storageservices/blob-service-error-codes).
+This list can be used for reference to catch thrown exceptions. To get the specific error code of the exception, use the `error_code` attribute, i.e, `exception.error_code`.
 
 ### Logging
 This library uses the standard

sdk/storage/azure-storage-file-share/README.md

@@ -288,7 +288,8 @@ the client level to enable it for all requests.
 ## Troubleshooting
 ### General
 Storage File clients raise exceptions defined in [Azure Core](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/core/azure-core/README.md).
-All File service operations will throw a `StorageErrorException` on failure with helpful [error codes](https://docs.microsoft.com/rest/api/storageservices/file-service-error-codes).
+
+This list can be used for reference to catch thrown exceptions. To get the specific error code of the exception, use the `error_code` attribute, i.e, `exception.error_code`.
 
 ### Logging
 This library uses the standard

sdk/storage/azure-storage-queue/README.md

@@ -304,7 +304,8 @@ the client level to enable it for all requests.
 ## Troubleshooting
 ### General
 Storage Queue clients raise exceptions defined in [Azure Core](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/core/azure-core/README.md).
-All Queue service operations will throw a `StorageErrorException` on failure with helpful [error codes](https://docs.microsoft.com/rest/api/storageservices/queue-service-error-codes).
+
+This list can be used for reference to catch thrown exceptions. To get the specific error code of the exception, use the `error_code` attribute, i.e, `exception.error_code`.
 
 ### Logging
 This library uses the standard