Update MAUI DataGrid ToolTip user guide documentation

[ShanmuganSekar-SF4698]

Description:

This PR updates the user guide documentation for the ToolTip feature in .NET MAUI DataGrid (SfDataGrid) control. The documentation provides comprehensive guidance on implementing and customizing tooltips for enhanced user experience.

Documentation Sections Added

1. Record cell tooltip - Basic tooltip enabling and configuration
2. ToolTip Customization - Styling options with DataGridToolTipView
3. ToolTipTemplate - Custom content and appearance using DataTemplate
4. ToolTipTemplateSelector - Conditional tooltip templates using DataTemplateSelector
5. Events - CellToolTipOpening event handling and customization

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: MAUI-DataGrid-ToolTip

[SyncfusionBuild]

CI Status: FAILURE ❌
Source Compilation: SUCCESS ✅
Failure Reason: CI Failure with violation
Build Location: MAUI-DataGrid-ToolTip
Technical Error(s): 0
Spelling Error(s): 0
Image Alt Text Error(s): 0
Image Size Error(s): 5
Image Name Error(s): 0
Front matter Error(s): 0
File Path Error(s): 1
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: MAUI-DataGrid-ToolTip

[SyncfusionBuild]

CI Status: FAILURE ❌
Source Compilation: SUCCESS ✅
Failure Reason: CI Failure with violation
Build Location: MAUI-DataGrid-ToolTip
Technical Error(s): 0
Spelling Error(s): 0
Image Alt Text Error(s): 0
Image Size Error(s): 5
Image Name Error(s): 0
Front matter Error(s): 0
File Path Error(s): 1
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0
MD Tag Validation Error(s): 0