Task(1033765):MarkdownView UG Documentation review changes - WinUI platform.

[Tamilselvan-Gopal-SF5415]

Description

Updated loading-content.md file and added the gifs for the Load from local file and Load from URL to the WinUI MarkdownViewer control.

AI Usage

Code Studio used in this PR?

• Yes

• No

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: WinUI_MarkdownView_Docs_Hot

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: WinUI_MarkdownView_Docs_Hot
Technical Error(s): 0
Spelling Error(s): 0
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
Front matter Error(s): 0
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0
MD Tag Validation Error(s): 0

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: WinUI_MarkdownView_Docs_Hot

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: WinUI_MarkdownView_Docs_Hot
Technical Error(s): 0
Spelling Error(s): 0
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
Front matter Error(s): 0
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0
MD Tag Validation Error(s): 0