Minor docstring updates (#2418)

* Minor docstring updates

* Update qiskit_ibm_runtime/session.py

Co-authored-by: Elena Peña Tapia <[email protected]>

---------

Co-authored-by: Elena Peña Tapia <[email protected]>

Author: kt474

qiskit_ibm_runtime/qiskit_runtime_service.py

@@ -561,8 +561,8 @@ def backends(
                     # Get the backends that support OpenPulse
                     QiskitRuntimeService.backends(open_pulse=True)
 
-                For the full list of backend attributes, see the `IBMBackend` class documentation
-                <https://quantum.cloud.ibm.com/docs/api/qiskit/1.4/providers_models>
+                For the full list of backend attributes, see the `IBMBackend class documentation
+                <https://quantum.cloud.ibm.com/docs/api/qiskit-ibm-runtime>`_
 
         Returns:
             The list of available backends that match the filter.

qiskit_ibm_runtime/session.py

@@ -319,7 +319,16 @@ def service(self) -> QiskitRuntimeService:
 
     @classmethod
     def from_id(cls, session_id: str, service: QiskitRuntimeService) -> "Session":
-        """Construct a Session object with a given session_id
+        """Construct a Session object with a given ``session_id``. For example:
+
+        .. code-block::
+
+            from qiskit_ibm_runtime import QiskitRuntimeService, Session
+            service = QiskitRuntimeService()
+            job = service.job(<job_id>)
+            existing_session_id = job.session_id
+
+            new_session = Session.from_id(existing_session_id, service)
 
         Args:
             session_id: the id of the session to be created. This must be an already