[Identity] Update broker docs (Azure#35032)

Using a more preferred term.

Signed-off-by: Paul Van Eck <paulvaneck@microsoft.com>

sdk/identity/azure-identity-broker/README.md

@@ -56,7 +56,7 @@ credential = InteractiveBrowserBrokerCredential(parent_window_handle=current_win
 client = BlobServiceClient(account_url, credential=credential)
 ```
 
-To bypass the account selection dialog and use the account currently signed into the operating system, set the `use_default_broker_account` argument to `True`. The credential will attempt to silently use the default broker account. If using the default account fails, the credential will fall back to interactive authentication.
+To bypass the account selection dialog and use the default broker account, set the `use_default_broker_account` argument to `True`. The credential will attempt to silently use the default broker account. If using the default account fails, the credential will fall back to interactive authentication.
 
 ```python
 credential = InteractiveBrowserBrokerCredential(

sdk/identity/azure-identity-broker/azure/identity/broker/_browser.py

@@ -37,8 +37,8 @@ class InteractiveBrowserBrokerCredential(_InteractiveBrowserCredential):
     :keyword int timeout: seconds to wait for the user to complete authentication. Defaults to 300 (5 minutes).
     :keyword int parent_window_handle: If your app is a GUI app running on a modern Windows system, you are required to
         also provide its window handle so that the sign in UI window will properly pop up on top of your window.
-    :keyword bool use_default_broker_account: Whether to authenticate with the currently signed in user instead of
-        prompting the user with a login dialog. Defaults to False.
+    :keyword bool use_default_broker_account: Enables automatically using the default broker account for
+        authentication instead of prompting the user with an account picker. Defaults to False.
     :keyword bool enable_msa_passthrough: Determines whether Microsoft Account (MSA) passthrough is enabled. Note, this
         is only needed for select legacy first-party applications. Defaults to False.
     :keyword bool disable_instance_discovery: Determines whether or not instance discovery is performed when attempting