CONTRIBUTING: Adjust commands to Scylla

Gets rid of some Cassandra leftovers, and updates some mentioned Scylla
versions.

Author: Lorak-mmk

CONTRIBUTING.rst

@@ -65,11 +65,11 @@ You can run a specific test method like so::
 Running Integration Tests
 -------------------------
 In order to run integration tests, you must specify a version to run using either of:
-* ``SCYLLA_VERSION`` e.g. ``release:5.1``
+* ``SCYLLA_VERSION`` e.g. ``release:2025.2``
 * ``CASSANDRA_VERSION``
 environment variable::
 
-    SCYLLA_VERSION="release:5.1" uv run pytest tests/integration/standard tests/integration/cqlengine/
+    SCYLLA_VERSION="release:2025.2" uv run pytest tests/integration/standard tests/integration/cqlengine/
 
 Or you can specify a scylla/cassandra directory (to test unreleased versions)::
 
@@ -104,9 +104,9 @@ Use tee to capture logs and see them on your terminal::
 
 Running the Benchmarks
 ======================
-There needs to be a version of cassandra running locally so before running the benchmarks, if ccm is installed:
+There needs to be a version of Scyll running locally so before running the benchmarks, if ccm is installed:
 
-	uv run ccm create benchmark_cluster -v 3.0.1 -n 1 -s
+	uv run ccm create benchmark_cluster --scylla -v release:2025.2 -n 1 -s
 
 To run the benchmarks, pick one of the files under the ``benchmarks/`` dir and run it::