update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/release-notes/changelogs/OpenHarmony_4.0.9.5/changelogs-filemanagement.md

-# File Management Subsystem Changelog
-## c1.filemanager.1 Change of the fileAccess Module
-The **fileAccess** module will no longer support operations for obtaining thumbnails and media assets.
-
-**Change Impact**
-1. Deleted **getThumbnail()**.
-2. Deleted the **FILEKEY** of image and audio options.
-
-**Key API/Component Changes**
-Deleted APIs:
-
-| Class          | API                                                |
-| -------------- | ------------------------------------------------------------ |
-| fileAccessHelper | getThumbnail(uri: string, size: image.Size): Promise<image.PixelMap>;|
-| fileAccessHelper | getThumbnail(uri: string, size: image.Size, callback: AsyncCallback<image.PixelMap>): void;|
-
-Deleted options:
-| Enum| Deleted Key Value|
-| -------- | ---- |
-| FileKey | DURATION = 'duration' |
-| FileKey | WIDTH = 'width' |
-| FileKey | HEIGHT = 'height' |