Document the common API methods the `ExecutionStrategy` does (not) apply to

The content on this topic is really useful. However, it doesn't clearly document the common API methods the `ExecutionStrategy` does — and does not — apply to.

For my purposes, I needed to know whether `ExecuteSqlCommandAsync` used the current `ExecutionStrategy` after seeing transient errors impact a web application health check.

Use case question: https://twitter.com/mattbrooks2010/status/1286063862370971648

Use case solution:

```csharp
await context.Database.CreateExecutionStrategy().ExecuteAsync(async () =>
{
// Check we can communicate successfully with the app database.
await context.Database.ExecuteSqlCommandAsync("SELECT 1");
});
```

A colleague of mine did eventually find this existing API documentation: https://github.com/dotnet/efcore/blob/59734ea22f29d22f8d0c1673c59a99c54ec4e78d/src/EFCore.Relational/Extensions/RelationalDatabaseFacadeExtensions.cs#L120-L123

---
#### Document Details

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

* ID: 876c88d4-2972-d905-28d7-56f9e589f309
* Version Independent ID: 29002343-fa42-2f49-3362-53592039b26d
* Content: [Connection Resiliency - EF Core](https://docs.microsoft.com/en-us/ef/core/miscellaneous/connection-resiliency)
* Content Source: [entity-framework/core/miscellaneous/connection-resiliency.md](https://github.com/dotnet/EntityFramework.Docs/blob/master/entity-framework/core/miscellaneous/connection-resiliency.md)
* Product: **entity-framework**
* Technology: **entity-framework-core**
* GitHub Login: @rowanmiller
* Microsoft Alias: **avickers**