[clangd] extend and rearrange doxygen hover documentation (#152918) This is the final patch to solve clangd/clangd#529. This uses the patches from [llvm/llvm-project#140498](https://github.com/llvm/llvm-project/pull/140498) and [llvm/llvm-project#150790](https://github.com/llvm/llvm-project/pull/150790) to improve the hover content for doxygen documented code. The patch uses the information from the parsed doxygen comment to extend and rearrange the hover documentation: - own section for brief, notes and warning documentation - for functions add parameter/template parameter documentation - for functions add return documentation Note: this requires to configure ```yaml Documentation: CommentFormat: Doxygen ``` in your `.clangd` configuration. --------- Co-authored-by: Maksim Ivanov <emaxx@google.com>
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