Documentation(EJ2-1015310): Add content for integrate spreadsheet into existing layouts in react spreadsheet ug documentation.

[NITHISHKUMARRAVIKUMAR]

UG documentation 1015310: Documentation Improvement - add User Interface Customization details in react spreadsheet ug documentation.

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: EJ2-1015310-ug1

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: EJ2-1015310-ug1
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

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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]

Build Status: INPROGRESS 🔃
Build Location: EJ2-1015310-ug1

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: EJ2-1015310-ug1
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