docs: adjust v11 release guide (#2197)

### 🎯 Goal

Add missing part about `useImageFlagEmojisOnWindows`.

Author: arnautov-anton

.github/workflows/release.yml

@@ -53,7 +53,7 @@ jobs:
     name: Publish documentation from "${{ github.ref_name }}" branch to ${{ inputs.docs_env }}
     runs-on: ubuntu-latest
     # skip during dry runs, release to production only from master, release to staging from anywhere
-    if: ${{ !inputs.dry_run && ((inputs.docs_env == 'production' && github.ref_name == 'master') || (github.ref_name != 'master' && inputs.docs_env == 'staging')) }}
+    if: ${{ !inputs.dry_run && ((github.ref_name == 'master' && contains('production,staging', inputs.docs_env)) || (github.ref_name != 'master' && inputs.docs_env == 'staging')) }}
     outputs:
       target-version: $${{ steps.target-version.outputs }}
     steps:

docusaurus/docs/React/release-guides/upgrade-to-v11.mdx

@@ -525,3 +525,20 @@ const customRenderText = (text, mentionedUsers) =>
 
 const CustomMessageList = () => <MessageList renderText={customRenderText} />;
 ```
+
+## Flag `useImageFlagEmojisOnWindows`
+
+Since this release you'll need to explicitly import extra stylesheet from `stream-chat-react/css/v2/emoji-replacement.css` as it has been removed from our main stylesheet to reduce final bundle size for integrators who do not wish to use this feature.
+
+```tsx
+import { Chat } from 'stream-chat-react';
+
+import 'stream-chat-react/css/v2/index.css';
+import 'stream-chat-react/css/v2/emoji-replacement.css';
+
+export const WrappedChat = ({ children, client }) => (
+  <Chat useImageFlagEmojisOnWindows client={client}>
+    {children}
+  </Chat>
+);
+```