ASP0019: Add documentation for new analyzers

[david-acker]

[EDIT by guardrex to add the metadata. This will be for a new topic, but there will be an entry for the overview of the node. I'll use the overview's metadata.]

Add docs for the following analyzers:

Merged:

• ASP0015-18 Source

In PR:

• ASP0019 Add analyzer and code fix to recommend against IHeaderDictionary.Add aspnetcore#44463

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Document Details

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• ID: 657f3da7-ec96-7d56-f1b4-4787e0f0fd84
• Version Independent ID: 657f3da7-ec96-7d56-f1b4-4787e0f0fd84
• Content: Code analysis in ASP.NET Core apps
• Content Source: aspnetcore/diagnostics/code-analysis.md
• Product: aspnet-core
• GitHub Login: @Rick-Anderson
• Microsoft Alias: riande

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Associated WorkItem - 33243