Completion don't provide property target in record parameter 

**Version Used**: 
VS 16.9.0

**Steps to Reproduce**:

```csharp
public record R([/*here*/] string M);

// modifying attribute target:
public record R([/*here*/ SomeAttribute] string M);

// adding attribute:
public record R([/*here*/ string M);
```

**Expected Behavior**:
Contextual keyword `property` provided.

**Actual Behavior**:
No contextual keyword `property` provided.
