Update algorithms deprecation message/reno (#10500)

* Update reno

* Update deprecation warning

(cherry picked from commit f01b7ab)

qiskit/algorithms/__init__.py

@@ -20,8 +20,11 @@
     The :mod:`qiskit.algorithms` module has been migrated to an independent package:
     https://github.com/qiskit-community/qiskit-algorithms.
     The current import path is deprecated and will be removed no earlier
-    than 3 months after the release date. You can run ``pip install qiskit_algorithms``
-    and import ``from qiskit_algorithms`` instead.
+    than 3 months after the release date. If your code uses primitives, you can run
+    ``pip install qiskit_algorithms`` and import ``from qiskit_algorithms`` instead.
+    If you use opflow/quantum instance-based algorithms, please update your code to
+    use primitives following: https://qisk.it/algo_migration before migrating to
+    the new package.
 
 It contains a collection of quantum algorithms, for use with quantum computers, to
 carry out research and investigate how to solve problems in different domains on

releasenotes/notes/0.25/deprecate-algorithms-7149dee2da586549.yaml

@@ -12,11 +12,13 @@ deprecations:
     of new features has moved to the new package.
     If you're relying on :mod:`qiskit.algorithms` you should update your
     requirements to also include ``qiskit-algorithms`` and update the imports
-    from ``qiskit.algorithms`` to ``qiskit_algorithms``. If you have not yet
+    from ``qiskit.algorithms`` to ``qiskit_algorithms``. Please note that this
+    new package does not include already deprecated algorithms code, including
+    ``opflow`` and ``QuantumInstance``-based algorithms. If you have not yet
     migrated from ``QuantumInstance``-based to primitives-based algorithms,
     you should follow the migration guidelines in https://qisk.it/algo_migration.
-    The decision to migrate the :mod:`~.algorithms` module to a 
-    separate package was made to clarify the purpose Qiskit and 
+    The decision to migrate the :mod:`~.algorithms` module to a
+    separate package was made to clarify the purpose Qiskit and
     make a distinction between the tools and libraries built on top of it.