[clang] [libclang/python] Add deprecation warnings to CompletionChunk.isKind methods (PR #177854)

[Vlad Serebrennikov via cfe-commits]

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@@ -302,6 +302,10 @@ Sanitizers
 
 Python Binding Changes
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+- Add deprecation warnings to ``CompletionChunk.isKind...`` methods.
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Endilll wrote:

We should explicitly spell names of the methods here to make it easier to search for

https://github.com/llvm/llvm-project/pull/177854