FLUT-1020062: Enhanced Flutter Introduction UG documentation

[Harsha-SF4223]

Description

Enhanced the Flutter User Guide documentation for the Introduction section, covering the product overview, API reference index, widget examples, and widgets catalog.

Files Updated

https://help.syncfusion.com/flutter/introduction/overview
https://help.syncfusion.com/flutter/introduction/api-reference
https://help.syncfusion.com/flutter/introduction/widget-examples
https://help.syncfusion.com/flutter/introduction/widgets-catalog

Changes Made

Added

• Added table headers (<th>Widget</th><th>API Reference</th>) to the API reference index.
• Added usage instructions: "Click the link to open the API reference... Use the search box..." on the API reference page.
• Added link to the Syncfusion Knowledge Base in the overview: [Knowledge Base](https://www.syncfusion.com/kb/flutter).
• Added reference to Flutter themes in the widgets catalog: https://help.syncfusion.com/flutter/themes.

Updated

• Improved grammar and terminology across all four pages.
• Renamed widget-examples.md title from "Flutter Widgets Examples" to "Syncfusion Flutter Widgets Examples".
• Renamed widgets-catalog.md title from "Flutter Widgets Catalog" to "Syncfusion Flutter Widgets Catalog".
• Replaced the generic video tutorial URL (/tutorial-videos) with the Flutter-specific path: /tutorial-videos/flutter.
• Replaced the local IP example URL (http://172.16.0.76/flutter/pdf-viewer/overview) with the public production URL: https://help.syncfusion.com/flutter/pdf-viewer/overview.
• Standardized "cross platform" / "cross-platform" hyphenation to "cross-platform" in the widgets catalog.
• Replaced informal language ("cool features") with professional terminology ("Key features").
• Replaced "its package link" with the more descriptive phrase "a link to its pub.dev package".
• Updated widget naming to match official convention: AIAssistView → AI AssistView.
• Clarified the syncfusion_flutter_core note: "Some packages like syncfusion_flutter_core don't have standalone examples".

Fixed

• api-reference.md: Fixed possessive plural: API's → APIs.
• overview.md:
  • Replaced Unicode hyphens with standard hyphens: Step‑by‑step → Step-by-step (2 instances).
  • Fixed tense: "had asked" → "have asked".
  • Made the support section heading formal: "Create a support incident" → "Creating a support incident".
  • Simplified wordy intro: "In case, you are not able to find" → "If you are unable to find".
  • Consolidated duplicate Knowledge Base description.
• widget-examples.md: Fixed local IP example to a safe production URL.
• widgets-catalog.md: Fixed incomplete sentence ("its package link" → "a link to its pub.dev package").

Why This Change?

• Improve clarity and professionalism in the introductory documentation.
• Eliminate broken, local, or generic URLs.
• Align widget naming and terminology with current Syncfusion conventions.
• Ensure table and link structures match the rest of the Flutter User Guide.
• Make the entry-point pages easier to follow for new developers.

Validation

• Verified documentation flow
• Verified all links are active and public
• Reviewed grammar and readability
• Checked for errors after edits in all files

Impact

• No API changes.
• No functional changes.
• Documentation enhancement only.

Documentation Enhancement Metrics

Category	Count
Missing Steps Added	2
Technical Corrections	5
Missing Information Added	3
Grammar Improvements	5
Clarity Improvements	4
Files Modified	4

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: FLUT-1020062-enhance-introduction

[SyncfusionBuild]

CI Status: FAILURE ❌
Source Compilation: SUCCESS ✅
Failure Reason: CI Failure with violation
Build Location: FLUT-1020062-enhance-introduction
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name 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: FLUT-1020062-enhance-introduction

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: FLUT-1020062-enhance-introduction
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

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: FLUT-1020062-enhance-introduction

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: FLUT-1020062-enhance-introduction
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

[Harsha-SF4223]

Created new PR with these changes - #1514