fix: correct broken links to Policy Exceptions and Cleanup Policies

Update broken links in policy-rules documentation:
- Fix Policy Exceptions link from /docs/policy-types/cluster-policy/exceptions.md to /docs/exceptions/
- Fix Cleanup Policies link from /docs/policy-types/cluster-policy/cleanup.md to /docs/policy-types/cleanup-policy/

Both links were returning 404 errors and now point to the correct documentation pages.

Fixes #1578

Signed-off-by: ash01ish <53890434+ash01ish@users.noreply.github.com>

Author: ash01ish

content/en/docs/policy-types/cluster-policy/policy-rules/_index.md

@@ -20,6 +20,6 @@ Each rule consists of a [`match`](/docs/policy-types/cluster-policy/match-exclud
 
 Policies can be defined as cluster-wide resources (using the kind `ClusterPolicy`) or namespaced resources (using the kind `Policy`). As expected, namespaced policies will only apply to resources within the namespace in which they are defined while cluster-wide policies are applied to matching resources across all namespaces. Otherwise, there is no difference between the two types.
 
-Additional policy types include [Policy Exceptions](/docs/policy-types/cluster-policy/exceptions.md) and [Cleanup Policies](/docs/policy-types/cluster-policy/cleanup.md) which are separate resources and described further in the documentation.
+Additional policy types include [Policy Exceptions](/docs/exceptions/) and [Cleanup Policies](/docs/policy-types/cleanup-policy/) which are separate resources and described further in the documentation.
 
 Learn more about [Applying Policies](/docs/applying-policies/) and [Writing Policies](/docs/policy-types/cluster-policy/_index.md) in the upcoming chapters.