Removed DefaultAzureCredential name from checkpoint store readme (Azure#2891)

Note that this does *not* fix the link to DefaultAzureCredential in the
LINKS section because there is no current link for
DeveloperToolsCredential.

Author: LarryOsterman

sdk/eventhubs/azure_messaging_eventhubs_checkpointstore_blob/README.md

@@ -58,15 +58,15 @@ cargo add azure_identity tokio azure_messaging_eventhubs azure_storage_blob
 
 Before interacting with Azure services, you need a credential to use to authenticate and authorize the user.
 
-The example shown below uses a [`DefaultAzureCredential`][default_cred_ref], which is appropriate for most local development environments. Additionally, we recommend using a managed identity for authentication in production environments. You can find more information on different ways of authenticating and their corresponding credential types in the [Azure Identity] documentation.
+The example shown below uses a [`DeveloperToolsCredential`][default_cred_ref], which is appropriate for most local development environments. Additionally, we recommend using a managed identity for authentication in production environments. You can find more information on different ways of authenticating and their corresponding credential types in the [Azure Identity] documentation.
 
-The `DefaultAzureCredential` will automatically pick up on an Azure CLI authentication. Ensure you are logged in with the Azure CLI:
+The `DeveloperToolsCredential` will automatically pick up on an Azure CLI authentication. Ensure you are logged in with the Azure CLI:
 
 ```azurecli
 az login
 ```
 
-Instantiate a `DefaultAzureCredential` to pass to the client. The same instance of a token credential can be used with multiple clients if they will be authenticating with the same identity.
+Instantiate a `DeveloperToolsCredential` to pass to the client. The same instance of a token credential can be used with multiple clients if they will be authenticating with the same identity.
 
 ### Basic Example