989661: Updated Playground Samples in docs

[sanjaykumar-suresh]

I have updated the samples in the documentation for the below mentioned headings.

Pdf Export (Exporting with custom aggregate)
PDF Options (File Name, )
Adding Header and Footer.
PDF Export templates

1. col template
2. group caption template.

Excel-Export (Exporting with Custom aggregate)
Excel Export Options (

1. additional worksheets to Excel,
   2 . Conditional Cell formating)
   Excel Export templates
2. col template
3. group caption template.

Clipboard
Context Menu
WASM Performance
Styles and Appearence
How To (1)

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: 989661-PlaygroundSampleChngs

[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: 989661-PlaygroundSampleChngs

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: 989661-PlaygroundSampleChngs

[SyncfusionBuild]

CI Status: FAILURE ❌
Source Compilation: SUCCESS ✅
Failure Reason: CI Failure with violation
Build Location: 989661-PlaygroundSampleChngs
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): 6
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

[VigneshNatarajan27]

changes are fine. since sample are updated as per core team suggestion