[clang] Fix attr docs from previous no-unique-adderss change (PR #67195)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

<details>
<summary>Changes</summary>

Previous change in https://github.com/llvm/llvm-project/pull/65675 broke the docs generation. 

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Full diff: https://github.com/llvm/llvm-project/pull/67195.diff


1 Files Affected:

- (modified) clang/include/clang/Basic/Attr.td (-1) 


``````````diff
diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
index bb8d204f33dc531..35eb6ff63132629 100644
--- a/clang/include/clang/Basic/Attr.td
+++ b/clang/include/clang/Basic/Attr.td
@@ -1803,7 +1803,6 @@ def NoUniqueAddress : InheritableAttr {
   // No spellings because instances of this attribute are created by
   // MSNoUniqueAddress and ItaniumNoUniqueAddress
   let Spellings = [];
-  let Documentation = [NoUniqueAddressDocs];
 }
 
 def MSNoUniqueAddress : InheritableAttr, TargetSpecificAttr<TargetMicrosoftCXXABI> {

``````````

</details>


https://github.com/llvm/llvm-project/pull/67195