Update Roslyn analyzer tutorial for modern Visual Studio project creation

[Copilot]

• Update the outdated "Visual C# > Extensibility" navigation instructions in the "Create the solution" section
• Replace with current instructions to search for "Analyzer" in the project template dialog
• Ensure the instructions reflect the modern Visual Studio project creation experience
• Fix UI element formatting: File > New > Project/Solution in how-to-write-csharp-analyzer-code-fix.md

Original prompt

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This section details on the original issue you should resolve

<issue_title>Solution creation instructions are slightly incorrect</issue_title>
<issue_description>https://docs.microsoft.com/en-us/dotnet/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix#create-the-solution
The instructions tell you to search for the Extensibility section: Under Visual C# > Extensibility, choose Analyzer with code fix (.NET Standard).. In the updated project creation dialog, the section no longer exists. Projects could be filtered by the Extensions project type, but searching for Analyzers should result in the most specific results.

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Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: 6e3fc905-7aa1-7f5e-9bfe-fbcef461ad5e
• Version Independent ID: a286e20b-1e43-dc57-e0fb-5a9dee7ec3f6
• Content: Tutorial: Write your first analyzer and code fix
• Content Source: docs/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix.md
• Product: dotnet-csharp
• Technology: csharp-roslyn
• GitHub Login: @BillWagner
• Microsoft Alias: wiwagn</issue_description>

Comments on the Issue (you are @copilot in this section)

@BillWagner Thanks for pointing this out @pranavkm

I've added it to our backlog to address in our next set of updates.</comment_new>

• Fixes Solution creation instructions are slightly incorrect #26719

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docs/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix.md	docs/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix

[Copilot]

Pull request overview

This PR updates the Roslyn analyzer tutorial to reflect modern Visual Studio's project creation workflow. The original issue (#26719) reported that navigation instructions using "Visual C# > Extensibility" no longer work in current Visual Studio versions. The PR addresses this by replacing hierarchical navigation with a search-based approach, which is the current standard for finding project templates in Visual Studio.

Changes:

• Updated project creation instructions to use search box instead of obsolete navigation paths
• Modernized documentation style throughout the tutorial (active voice, contractions, present tense)
• Updated Visual Studio version requirements to be more generic
• Added installation instructions for .NET Compiler Platform SDK with "Modify" button steps

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
includes/roslyn-installation.md	Added explicit "Modify" button selection steps to SDK installation instructions (contains spelling errors)
docs/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix.md	Updated project creation instructions to use search-based approach; modernized writing style throughout the tutorial; updated date and Visual Studio prerequisites