[clang] [libclang/python] Remove global SPELLING_CACHE alias (PR #210677)

[Vlad Serebrennikov via cfe-commits]

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@@ -58,6 +58,10 @@ latest release, please see the [Clang Web Site](https://clang.llvm.org) or the
 
 ### Clang Python Bindings Potentially Breaking Changes
 
+- Remove the deprecated `SPELLING_CACHE` alias.
+  All usage should be migrated to use `CompletionChunk.SPELLING_CACHE` instead.
+  Note that this uses `CompletionChunkKind` as keys, instead of the enum values.
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Endilll wrote:

```suggestion
  Note that this uses `CompletionChunkKind` enumeration as keys, instead of integer values.
```

https://github.com/llvm/llvm-project/pull/210677