RCS0036 without GenerateDocumentationFile shows error

Having a project without GenerateDocumentationFile property set to true and RCS0036 active shows an error.

**Steps to reproduce**
1. Have the GenerateDocumentationFile missing or set to false in the csproj
```

net8.0
false

```

2. Have a class with documentation on the properties
```
///
/// Test
///
public class TestClass
{
///
/// Create instance
///
public TestClass(string p1, string p2)
{
P1 = p1;
P2 = p2;
}

///
/// P1
///
public string P1 { get; }

///
/// P2
///
public string P2 { get; }
}
```

3. Build and see the error
```
error RCS0036: Remove blank line between single-line declarations of same kind
```

Start by reproducing issue 1608 with the shown C# project and class, using RCS0036 with GenerateDocumentationFile missing and set to false. Trace the RCS0036 analyzer and its tests to determine why it reports the blank-line error in these configurations; done means the build no longer reports RCS0036 when documentation generation is disabled.

Written by the indexing model from the issue text.