📖 Clarify install mode docs (#2430)

* Clarify install mode docs

* Consistent terminology

Author: oceanc80

docs/project/olmv1_limitations.md

@@ -8,7 +8,8 @@ hide:
 Currently, OLM v1 only supports installing operators packaged in [OLM v0 bundles](https://olm.operatorframework.io/docs/tasks/creating-operator-bundle/)
 , also known as `registry+v1` bundles. Additionally, the bundled operator, or cluster extension:
 
-* **must** support installation via the `AllNamespaces`, `SingleNamespace`, or `OwnNamespace` install modes. 
+* **must** support installation via the `AllNamespaces` install mode.
+    * Note that `AllNamespaces` is the recommended install mode. OLM v1 supports `SingleNamespace` and `OwnNamespace` modes for `registry+v1` bundles for backwards compatibility with OLM v0, but these are not recommended install modes as there is a [hard limitation](https://operator-framework.github.io/operator-controller/project/olmv1_design_decisions/#do-not-fight-kubernetes) of only one instance of a given CRD in the cluster.
 * **must not** declare dependencies using any of the following file-based catalog properties:
     * `olm.gvk.required`
     * `olm.package.required`