#22613: fix several factual errors in builtin docs (thanks Jacques Ducasse)
#22613: explain what "buffer" is in the struct documentation (thanks Jacques Ducasse)
#22613: elaborate on arguments of shutil archival functions (thanks Jacques Ducasse)
#22613: fix heading levels in tracemalloc docs (thanks Jacques Ducasse)
#22613: document Cmd.cmdqueue (thanks Jacques Ducasse)
#22613: minor other fixes in library docs (thanks Jacques Ducasse)
#22613: remaining corrections in extending/reference docs (thanks Jacques Ducasse)
Closes #22771: "verbose" is unused; deprecate it.