Adding process log enricher documentation

[mariamgerges]

Summary

Describe your changes here.

Fixes #Issue_Number (if available)

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Internal previews

📄 File	🔗 Preview link
docs/core/enrichment/custom-enricher.md	docs/core/enrichment/custom-enricher
docs/core/enrichment/overview.md	docs/core/enrichment/overview
docs/core/enrichment/process-log-enricher.md	docs/core/enrichment/process-log-enricher
docs/navigate/tools-diagnostics/toc.yml	docs/navigate/tools-diagnostics/toc

[Copilot]

Pull Request Overview

This PR adds documentation for the process log enricher functionality in .NET, introducing comprehensive guidance on how to use the process enricher to augment telemetry logs with process-specific information such as process ID and thread ID.

Key changes:

• Added new documentation article explaining process log enricher usage and configuration
• Created example code snippets demonstrating integration with host builder and dependency injection
• Updated table of contents to include the new enrichment section

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
docs/navigate/tools-diagnostics/toc.yml	Added new "Enrichment" section with process log enricher entry
docs/core/enrichment/process-log-enricher.md	Main documentation article explaining process enricher usage, configuration options, and examples
docs/core/enrichment/snippets/enrichment/Program.cs	Example console application demonstrating process enricher setup
docs/core/enrichment/snippets/enrichment/Log.cs	Helper class with LoggerMessage attribute for sample logging
docs/core/enrichment/snippets/enrichment/Enrichment.csproj	Project file with required NuGet package references

[Copilot]

According to the coding guidelines, this appears to be AI-generated content. The document should include the ai-usage frontmatter key with appropriate value (ai-generated or ai-assisted).

[evgenyfedorov2]

• I think we need an Overview page explaining what enrichment is. We can get an inspiration from Serilog https://github.com/serilog/serilog/wiki/Enrichment
• Instead of Enrichment, the title should be Log enrichment, at least for the foreseeable future. Because Trace enrichment is part of OpenTelemetry .NET and Metric enrichment just does not exist (recommended replacement is OpenTelemetry .NET Resource)
• Also we need information about dimension names (also known as keys, tags, etc)

[mariamgerges]

• I think we need an Overview page explaining what enrichment is. We can get an inspiration from Serilog https://github.com/serilog/serilog/wiki/Enrichment
• Instead of Enrichment, the title should be Log enrichment, at least for the foreseeable future. Because Trace enrichment is part of OpenTelemetry .NET and Metric enrichment just does not exist (recommended replacement is OpenTelemetry .NET Resource)
• Also we need information about dimension names (also known as keys, tags, etc)

I added an overview document and a custom enricher doc. please check