Document how to find DC backends (#3997)

closes #3982

---------

Co-authored-by: abbycross <[email protected]>

Author: beckykd

docs/guides/classical-feedforward-and-control-flow.ipynb

@@ -285,6 +285,34 @@
     "qc.draw(output=\"mpl\", style=\"iqp\", idle_wires=False, fold=-1)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "203cbeaa-3522-4ebd-8ac7-df7741f759f2",
+   "metadata": {},
+   "source": [
+    "## Find backends that support dynamic circuits\n",
+    "\n",
+    "To find all backends that support dynamic circuits and that your account can access, run code like the following.  This example assumes that you have [saved your login credentials.](/docs/guides/save-credentials)  You could also [initialize your Qiskit Runtime service account](/docs/guides/initialize-account#explicit) with manually-specified credentials.  In this case, you could view backends available on a specific instance or plan type, for example.\n",
+    "\n",
+    "<Admonition type=\"note\">\n",
+    "The backends that are available to the account depend on the instance specified in the credentials.\n",
+    "</Admonition>"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "2ddb1b97-4223-427b-a4cd-99e2f6ccbfe9",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from qiskit_ibm_runtime import QiskitRuntimeService\n",
+    "\n",
+    "service = QiskitRuntimeService()\n",
+    "dc_backends = service.backends(dynamic_circuits=True)\n",
+    "print(dc_backends)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "0378a45f-7a28-48bc-993d-0e4308d38bfc",

docs/guides/save-credentials.mdx

@@ -103,6 +103,10 @@ QiskitRuntimeService.save_account(
   )
  ```
 
+## View saved credentials
+
+To view all credentials that you have saved, run `service.saved_accounts()`.  Note that if you saved default credentials and didn't name them, they are named `default-ibm-quantum-platform`. If you did name your default credentials, you will see `"is_default_account": true` in the output.
+
 ## Considerations
 
 * If you are saving multiple accounts, use the `name` parameter to differentiate them.