Remove unused documentation

[maxRN]

This PR removes two parts of unused / superseded documentation upload_event and new_global.
upload_event was changed in commit 018e8e273c5e01e24efefa8e2b2b5a9e4145c7a1.
new_global was replaced by new_field I think, in commit 2cb98ad0a6e64d30144a2c6aef65140e6d5589fd.

[maxRN]

One more thing I forgot to mention: I only stumbled on these unused functions, because I somehow triggered a dune build that displayed those as errors. However I can't figure out how to get dune to display those errors again 😅 (I'm also surprised that it would even build in the first place while having unused functions)

[aantron]

Thank you! new_global was removed in d81b198. new_field replaces new_local (a rename), while "globals" were associated with "apps," a concept which was completely deleted in d81b198. Thanks for being thorough with the history search -- it saves me time!