Missing get_progress_messages() documentation

I’m looking for documentation for vim.lsp.util.get_progress_messages(), but cannot find it.

On Neovim 0.6.0 and 0.6.1, the documentation for LspProgressUpdate refers to that help tag but it does not appear to be available:

LspProgressUpdate                                          *LspProgressUpdate*
   Upon receipt of a progress notification from the server. See
   |vim.lsp.util.get_progress_messages()|.

Am I missing something, or can someone point me to the right place? Thanks!

There’s no documentation, the help tag can be removed. The function is quite simple, and marked private: