[docs-patrol] Document `use_minimal_state` for Filebeat entityanalytics `azure-ad` provider

Recent code changes in the repository have introduced documentation drift. The following change needs a corresponding documentation update.

## Changes Requiring Documentation Updates

### 1. `azure-ad` provider gained `use_minimal_state` but reference docs do not describe it

**Commit(s):**
- `e72da884de80e24dd7d5eb11de82a6ff65a17445` — https://github.com/elastic/beats/commit/e72da884de80e24dd7d5eb11de82a6ff65a17445

**What changed:**
- The Entra ID (`azure-ad`) entity analytics provider now supports minimal-state mode.
- Code evidence:
- `x-pack/filebeat/input/entityanalytics/provider/azuread/minimal.go:17-21` registers a minimal-state provider for `azure-ad`.
- `x-pack/filebeat/input/entityanalytics/conf.go:18-26` exposes and validates `use_minimal_state` in input config.
- `changelog/fragments/1779159472-entityanalytics-entraid-minimal-state.yaml:13-18` explicitly announces support for `use_minimal_state: true`.

**Documentation impact:**
- `docs/reference/filebeat/filebeat-input-entity-analytics.md:634-723` lists supported `azure-ad` configuration keys but does not document `use_minimal_state` or its behavior.
- Users relying on the provider reference cannot discover this new config mode from docs.

## Suggested Actions

- [ ] Update `docs/reference/filebeat/filebeat-input-entity-analytics.md` (`azure-ad` section) to document `use_minimal_state`.
- [ ] Add a short behavior note describing minimal-state mode semantics and any compatibility/operational caveats.
- [ ] Include a minimal YAML example showing `provider: azure-ad` with `use_minimal_state: true`.

> [!NOTE]
>
> 🔒 Integrity filter blocked 14 items
>
> The following items were blocked because they don't meet the GitHub integrity level.
>
> - [#50774](https://github.com/elastic/beats/issues/50774) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#49159](https://github.com/elastic/beats/issues/49159) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#49459](https://github.com/elastic/beats/issues/49459) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#41492](https://github.com/elastic/beats/issues/41492) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#49091](https://github.com/elastic/beats/issues/49091) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#49092](https://github.com/elastic/beats/issues/49092) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#49090](https://github.com/elastic/beats/issues/49090) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#49035](https://github.com/elastic/beats/issues/49035) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#44889](https://github.com/elastic/beats/issues/44889) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#40748](https://github.com/elastic/beats/issues/40748) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#51000](https://github.com/elastic/beats/pull/51000) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#50581](https://github.com/elastic/beats/pull/50581) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#49416](https://github.com/elastic/beats/pull/49416) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#50774](https://github.com/elastic/beats/issues/50774) `issue_read`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
>
> To allow these resources, lower `min-integrity` in your GitHub frontmatter:
>
> ```yaml
> tools:
> github:
> min-integrity: approved # merged | approved | unapproved | none
> ```
>
>

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Start with docs/reference/filebeat/filebeat-input-entity-analytics.md lines 634-723, then compare the azure-ad implementation in x-pack/filebeat/input/entityanalytics/provider/azuread/minimal.go and config handling in x-pack/filebeat/input/entityanalytics/conf.go. Check changelog/fragments/1779159472-entityanalytics-entraid-minimal-state.yaml for the announced behavior. Done means the azure-ad section documents use_minimal_state, explains minimal-state behavior and caveats, and includes a minimal YAML example.

Written by the indexing model from the issue text.