Update warning in README (#3381)

## Pull Request Info - SDK Docs Consolidation

Jira ticket: https://jira.mongodb.org/browse/DOCSP-NNNNN

### Staging Links
<!-- start insert-links -->
No pages to preview
<!-- end insert-links -->

*Page Source*

Add links to every SDK's pages where you got the SDK-specific
information:

-
[PAGE_NAME](https://www.mongodb.com/docs/atlas/device-sdks/LIVE-DOCS-LINK)

### PR Author Checklist

Before requesting a review for your PR, please check these items:

- [ ] Open the PR against the `feature-consolidated-sdk-docs` branch
instead of `master`
- [ ] Tag the consolidated page for:
  - genre
  - meta.keywords
  - meta.description

#### Naming
- [ ] Update Realm naming and the language around persistence
layer/local/device per [this
document](https://docs.google.com/document/d/126OczVxBWAwZ4P5ZsSM29WI3REvONEr1ald-mAwPtyQ/edit?usp=sharing)
- [ ] Include `.rst` files comply with [the naming
guidelines](https://docs.google.com/document/d/1h8cr66zoEVeXytVfvDxlCSsUS5IZwvUQvfSCEXNMpek/edit#heading=h.ulh8b5f2hu9)

#### Links and Refs
- [ ] Create new consolidated SDK ref targets starting with "_sdks-" for
relevant sections
- [ ] Remove or update any SDK-specific refs to use the new consolidated
SDK ref targets
- [ ] [Update any Kotlin API
links](https://jira.mongodb.org/browse/DOCSP-32519) to use the new
Kotlin SDK roles

#### Content
- [ ] Shared code boxes have snippets or placeholders for all 9
languages
- [ ] API description sections have API details or a generic placeholder
for all 9 languages
- [ ] Check related pages for relevant content to include
- [ ] Create a ticket for missing examples in each relevant SDK:
Consolidation Gaps epic

### Reviewer Checklist

As a reviewer, please check these items:

- [ ] Shared code example boxes contain language-specific snippets or
placeholders for every language
- [ ] API reference details contain working API reference links or
generic content
- [ ] Realm naming/language has been updated
- [ ] All relevant content from individual SDK pages is present on the
consolidated page

Author: krollins-mdb

README.rst

@@ -6,14 +6,12 @@ This repository contains documentation for MongoDB Realm.
 
 > [!WARNING]
 > As of September 2024, Atlas Device SDKs are deprecated. Atlas Device SDKs
-> will reach end-of-life and be removed on September 30, 2025. 
+> will reach end-of-life and will no longer be maintained by MongoDB on
+> September 30, 2025. 
 >
-> These services will reach end-of-life and be removed on September 30, 2025.
->
-> With the previously-announced GraphQL and Static Hosting deprecations, all of
-> the documentation in this repository is also deprecated. The documentation will
-> be updated on a best-effort basis until September 30, 2025. After that date,
-> the documentation will no longer be maintained.
+> The documentation in this repository will be updated on a best-effort basis
+> until September 30, 2025. After that date, the documentation will no longer
+> be maintained by MongoDB.
 
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