[clang-tools-extra] [clangd] Augment code completion results with documentation from the index. (PR #120099)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff 02328e0465c256293950542f1a85eb55bcbc9d45 ace8121506029e9016df9ec3bffa9d465334e97d --extensions cpp -- clang-tools-extra/clangd/CodeComplete.cpp clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
``````````

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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp b/clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
index 827b64c882..607236c5b0 100644
--- a/clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
+++ b/clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
@@ -1130,9 +1130,8 @@ int x = a.^
   auto CompletionList =
       llvm::cantFail(runCodeComplete(Server, File, Test.point(), {}));
 
-  EXPECT_THAT(
-      CompletionList.Completions,
-      Contains(AllOf(named("gamma"), doc("This is a member field."))));
+  EXPECT_THAT(CompletionList.Completions,
+              Contains(AllOf(named("gamma"), doc("This is a member field."))));
   EXPECT_THAT(
       CompletionList.Completions,
       Contains(AllOf(named("delta"), doc("This is a member function."))));

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https://github.com/llvm/llvm-project/pull/120099