move image helper API => dev preview

- update 1.14 release notes to reflect this feature is dev preview
- add note in docs indicating it's dev preview

Author: andrewconnell

docs/spfx/image-helper-api.md

@@ -1,7 +1,7 @@
 ---
 title: Image Helper API
 description: Learn how to use the Image Helper API in the SharePoint Framework to provide web-friendly optimized image links.
-ms.date: 02/08/2022
+ms.date: 02/25/2022
 ms.prod: sharepoint
 ms.localizationpriority: high
 ---
@@ -16,8 +16,8 @@ The helper method `ImageHelper.convertToImageUrl()` takes a Url to an asset on S
 
 The resulting Url will point to an image that is close to the requested size. The resulting Url will also include using other SharePoint media and graph services. If available for the requested asset, public or private CDN locations to serve the resized images and thumbnails.
 
-> [!IMPORTANT]
-> The Image Helper API was introduced in the SharePoint Framework v1.14 release.
+> [!NOTE]
+> The Image Helper API was introduced in the SharePoint Framework v1.14 release as a developer preview feature.
 
 ## Benefits to using this API
 

docs/spfx/release-1.14.md

@@ -1,7 +1,7 @@
 ---
 title: SharePoint Framework v1.14 release notes
 description: Release notes for the SharePoint Framework v1.14 release
-ms.date: 02/22/2022
+ms.date: 02/25/2022
 ms.prod: sharepoint
 ms.localizationpriority: high
 ---
@@ -13,7 +13,6 @@ This release introduces updates across the features around Microsoft Viva, Micro
 
 [!INCLUDE [spfx-release-notes-common](../../includes/snippets/spfx-release-notes-common.md)]
 
-
 ## Upgrading projects from v1.13.1 to v1.14
 
 1. In the project's **package.json** file, identify all SPFx v1.13.1 packages. For each SPFx package:
@@ -152,18 +151,10 @@ empty group header being displayed.
 The default value of `isGroupNameHidden` is false.
 
 #### ipAddress Property in serve.json
+
 New property `ipAddress` has been added to `serve.json` configuration. This parameter is helpful when using Docker containers. For example, to set the serve host as '0.0.0.0'.
 This property will be explicitly used to wind up the server, meaning all debug URLs and webpack configurations will not be affected.
 
-#### Image Helper API
-
-The **ImageHelper** static class (in @microsoft/sp-image-helper) has been added to allow SPFx developers runtime access to:
-
-- Urls of auto-generated thumbnail images of pages and documents stored in SharePoint
-- More optimized Urls to images stored in SharePoint
-
-Learn more: [Image Helper API](image-helper-api.md)
-
 ## Preview Features and Capabilities
 
 Following features are still in preview status as part of the 1.14 release and should not be used in production. We are looking into releasing them officially as part of the upcoming 1.15 release.
@@ -300,6 +291,14 @@ The Select Media Action can be used to select Images from your native device. In
 
 ![Screenshot of media panel](../images/release-notes/114/media-panel.jpg)
 
+#### Image Helper API
+
+The **ImageHelper** static class (in @microsoft/sp-image-helper) has been added to allow SPFx developers runtime access to:
+
+- Urls of auto-generated thumbnail images of pages and documents stored in SharePoint
+- More optimized Urls to images stored in SharePoint
+
+Learn more: [Image Helper API](image-helper-api.md)
 
 ## Deprecations and removed items in this release