The examples do not trigger CA2000

Neither of the examples on this page trigger CA2000 when using the Roslyn analyzers built into the project SDK. I am able to trigger CA2000 on other code in the same project (e.g. by not disposing a `SqlConnection`), but not from these examples. I initially thought that only the second example was a problem, because it uses a local `StreamReader`, even though the "Special Cases" section says that `TextReader` is excluded. However, the first example does not trigger CA2000 either.

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* ID: 80e2f8df-7039-c826-764e-88abefb6744b
* Version Independent ID: f75bace0-4c3a-5936-8e19-9e2334fd9848
* Content: [CA2000: Dispose objects before losing scope (code analysis) - .NET](https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca2000)
* Content Source: [docs/fundamentals/code-analysis/quality-rules/ca2000.md](https://github.com/dotnet/docs/blob/main/docs/fundamentals/code-analysis/quality-rules/ca2000.md)
* Product: **dotnet-fundamentals**
* GitHub Login: @gewarren
* Microsoft Alias: **gewarren**