docs(937286): Resolve the docs issues logged for our components.

[SenthilarasuBalu]

Description

Need to resolve the getting started issues logged for our components.
MCCB - Need to add the cs file while highlighting the tab.
Stepper - Need to add the missed closing tag in default stepper rendering.
ChatUI
Need to add all the sample corrections in Both Core and MVC.
Need to add the cs file while highlighting the tab.

Screenshot

NA

Areas affected and ensured

None

Test cases

NA

Test bed sample location

NA

Additional checklist

• Did you run the automation against your implementation? NA
• Is there any API name change? NA.
• Is there any existing behavior change of other features due to this code change? No
• Does your new code introduce new warnings or binding errors? No
• Does your code pass all FxCop and StyleCop rules? No
• Did you record this case in the unit test or UI test? No

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: EJ2-937286-gettingStrFix

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: EJ2-937286-gettingStrFix
Technical Error(s): 0
Spelling Error(s): 0
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