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

[Younan Zhang via cfe-commits]

zyn0217 wrote:

(A drive-by comment: I stumbled on the commit message of this PR and found it surprising that I'm the co-author of it! I'm not entirely clear on GitHub's schemas, but IMO shouldn't the co-author be the one who clicks the "merge" button?)

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