Add LINQKit section to extensions documentation

[anarahmadov]

Added a section about LINQKit, detailing its features and links to the GitHub repository and NuGet.

[anarahmadov]

Could you pls re-review changes?

[Copilot]

🟡 Changes recommended

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Pull request overview

Adds LINQKit to the EF Core “Tools & Extensions” documentation page, providing a brief feature summary plus links for discovery.

Changes:

• Added a new “LINQKit” subsection with a short feature list.
• Added external links to the LINQKit GitHub repository and NuGet.

File summaries

File	Description
entity-framework/core/extensions/index.md	Adds a LINQKit entry (description + links) to the tools/extensions listing.

Review details

Suppressed comments (1)

entity-framework/core/extensions/index.md:53

• The compatibility and NuGet link appear outdated for EF Core. LINQKit has a dedicated EF Core package (LinqKit.Microsoft.EntityFrameworkCore) with 10.x releases, so "For EF Core: 2-9" and the current NuGet link to /packages/linqkit are likely incorrect/misleading. Also, the blank line before the links contains trailing spaces which can fail markdownlint (MD009).

For EF Core: 2-9.
 
[GitHub repository](https://github.com/scottksmith95/LINQKit) | [NuGet](https://www.nuget.org/packages/linqkit)

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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[cincuranet]

@anarahmadov Please fix the Copilot's comments above. And also you MD has errors: entity-framework/core/extensions/index.md:52:1 error MD009/no-trailing-spaces Trailing spaces [Expected: 0 or 2; Actual: 1].