Include trademark symbol in WInUI UG document.

[YuvarajMasilamani]

Hi @SubashiniMahendran

I have included the TradeMark symbol in the WinUI UG Document. Kindly review and merge the changes.

Regards,
Yuvaraj M

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: Trademark_Symbol_Inclusion

[SyncfusionBuild]

CI Status: FAILURE ❌
Source Compilation: SUCCESS ✅
Failure Reason: CI Failure with violation
Build Location: Trademark_Symbol_Inclusion
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
FT Layout Syntax Error(s): 0
Front matter Error(s): 1
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: Trademark_Symbol_Inclusion

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: Trademark_Symbol_Inclusion
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
FT Layout Syntax 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]

The running CI Job is terminated due to changes committed on the source branch for this Merge Request and CI triggered for latest commit.

[SyncfusionBuild]

CI Status: ABORTED ❌
Source Compilation: FAILURE ❌
Build Location: Trademark_Symbol_Inclusion

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: Trademark_Symbol_Inclusion

[SyncfusionBuild]

CI Status: FAILURE ❌
Source Compilation: SUCCESS ✅
Failure Reason: CI Failure with violation
Build Location: Trademark_Symbol_Inclusion
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
FT Layout Syntax Error(s): 0
Front matter Error(s): 2
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: Trademark_Symbol_Inclusion

[Syncfusion-CI]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: Trademark_Symbol_Inclusion
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
FT Layout Syntax 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