New example of retrieving retired QR jobs (Qiskit#423)

closes Qiskit#398

docs/run/retired-systems.mdx

@@ -62,7 +62,9 @@ The following systems have been retired. For the full list of available systems,
 <span id="retrieve"></span>
 ## Retrieve a job from a retired system
 
-To retrieve jobs from a retired system, you can use code similar to this:
+To retrieve jobs from a retired system, you can use code similar to this, depending on the provider from which the job was sent:
+
+### For a job run from IBM Provider
 
 ```python
 from qiskit_ibm_provider import IBMProvider
@@ -74,4 +76,19 @@ jobs = provider.backend.jobs(backend_name=<backend_name>)
 
 #If you want to retrieve a specific job you have the id for
 job = provider.backend.retrieve_job(<job_id>)
+```
+
+### For a job run from Qiskit Runtime
+
+```python
+from qiskit_ibm_runtime import QiskitRuntimeService
+
+# Load your IBM Quantum account(s). Replace "hub/group/project" with your desired instance
+service = QiskitRuntimeService(channel="ibm_quantum", instance="hub/group/project")
+
+# Retrieve a single job by id
+job = service.job(<job_id>)
+
+# Retrieve a batch of jobs. Filtering options can be found in the QiskitRuntimeService.jobs api reference
+jobs = service.jobs(backend_name=<backend_name>)
 ```