Update install.mdx with version

docs/start/install.mdx

@@ -367,7 +367,7 @@ QPY support
 The QPY serialization format is backwards-compatible so that a new Qiskit release can always load a QPY
 file generated with an earlier release of Qiskit. However, the format isn't forward-compatible so, in principle, it's not possible
 to load QPY files generated with a newer version of Qiskit using an older release.  To facilitate user migration across major version releases, the (`qiskit.qpy.dump()`](/api/qiskit/qpy#dump) function will always support at least one overlapping version between the `X.0.0` and the `X-1.Y.0` release (where `Y` is the last minor version of 
-that series). This will enable saving QPY format files that can be loaded by both major versions from the newer
+that series). The parameter `qiskit.qpy.dump(..., version=...)` will enable saving QPY format files that can be loaded by both major versions from the newer
 release. See more details in [RFC 0020](https://github.com/Qiskit/RFCs/blob/master/0020-release_cycle.md#qpy-support).
 </details>