[clang] [APINotes] Update the documentation with new features (PR #95162)

[Saleem Abdulrasool via cfe-commits]

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@@ -157,6 +158,36 @@ declaration kind), all of which are optional:
     - Class: NSBundle
       SwiftName: Bundle
 
+:SwiftImportAs:
+
+  For a class, possible values are ``owned`` (equivalent to
+  ``SWIFT_SELF_CONTAINED``), ``reference`` (equivalent to
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compnerd wrote:

```suggestion
  ``SWIFT_SELF_CONTAINED``) or ``reference`` (equivalent to
```

https://github.com/llvm/llvm-project/pull/95162