Updates documentation for policy and listSize directives (#3297)

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Updates documentation to reflect feature tiering changes made in the
[recent router
release](https://github.com/apollographql/router/releases/tag/v2.6.0).

References:

- [Product's feature tiering
matrix](https://docs.google.com/document/d/13wh3NBmBnSPKBCH1f19eir-caWbz6Y9wKEHItXq6l1c/edit?tab=t.7kwmpu4gs3p#heading=h.37ncslwgnmfs)

- [Additional feedback from
product](https://docs.google.com/document/d/1ea30pyaIAaBg4xTUXuUDDa3w16fhhR7KvEm3QQNE-D8/edit?tab=t.pyvj315sx3ne#heading=h.gx3p2h7ez2ov)

### Testing
Ran the docs site locally using `librarian.local.config.mts` file with
override for the `federation` repository.

Specifically, the following pages were checked:
-
http://localhost:3000/docs/graphos/schema-design/federated-schemas/reference/directives#listsize
-
http://localhost:3000/docs/graphos/schema-design/federated-schemas/reference/directives#policy

Author: DMallare

docs/source/schema-design/federated-schemas/reference/directives.mdx

@@ -504,7 +504,7 @@ Indicates to composition that the target element is accessible only to the authe
 
 <MinVersionBadge version="Federation v2.6" />
 
-<EnterpriseDirective />
+<LicensedDirective />
 
 ```graphql
 directive @policy(policies: [[federation__Policy!]!]!) on
@@ -993,7 +993,7 @@ Regardless of whether `@cost` is specified on a field, the field cost for that f
 
 <MinVersionBadge version="Federation v2.9" />
 
-<EnterpriseFeature />
+<LicensedDirective />
 
 ```graphql
 directive @listSize(assumedSize: Int, slicingArguments: [String!], sizedFields: [String!], requireOneSlicingArgument: Boolean = true) on FIELD_DEFINITION