More partial members: be more specific what auto-property declaration can't be used for. (#44004)

Author: tmds

docs/csharp/whats-new/csharp-13.md

@@ -135,7 +135,7 @@ Learn more in the updates on [`ref struct` types](../language-reference/builtin-
 
 ## More partial members
 
-You can declare `partial` properties and `partial` indexers in C# 13. Partial properties and indexers generally follow the same rules as `partial` methods: you create one *declaring declaration* and one *implementing declaration*. The signatures of the two declarations must match. One restriction is that you can't use an auto-property declaration for a partial property. Properties that don't declare a body are considered the *declaring declaration*.
+You can declare `partial` properties and `partial` indexers in C# 13. Partial properties and indexers generally follow the same rules as `partial` methods: you create one *declaring declaration* and one *implementing declaration*. The signatures of the two declarations must match. One restriction is that you can't use an auto-property declaration for *implementing* a partial property. Properties that don't declare a body are considered the *declaring declaration*.
 
 ```csharp
 public partial class C