[llvm] [clangd] Support square bracket escaping in Annotations (PR #69379)

[Aleksey Fefelov via llvm-commits]

fefaleksey wrote:

> The usual workaround for this is to use the digraph `<:` in place of `[`. Does this work for your case?
> 
> I'd prefer not to add a second escaping mechanism if the existing one does work, maybe we should document it though.

Yes, it works well, thank you!

https://github.com/llvm/llvm-project/pull/69379