[clang] [clang-tools-extra] [llvm] [clangd] Fix is spelled in source bug (PR #76668)

[Younan Zhang via cfe-commits]

https://github.com/zyn0217 commented:

Thanks for your contribution! A couple of nit-picks, and I’d leave the approval to other folks.

https://github.com/llvm/llvm-project/pull/76668