Adjust yaml indentation on allowedHostPaths example (#27731)

* Adjust yaml indentation on allowedHostPaths

allowedHostPaths is an attribute inside spec: of PSP, so the sample needs to be shifted to match the YAML.

* Adjusted the PSP example allowedHostPaths coments

Adjusted the whole example (including the #coments)

content/en/docs/concepts/policy/pod-security-policy.md

@@ -464,7 +464,7 @@ allowed prefix, and a `readOnly` field indicating it must be mounted read-only.
 For example:
 
 ```yaml
-allowedHostPaths:
+  allowedHostPaths:
     # This allows "/foo", "/foo/", "/foo/bar" etc., but
     # disallows "/fool", "/etc/foo" etc.
     # "/foo/../" is never valid.