pageinspect bt_page_items doc

hi.

https://www.postgresql.org/docs/current/pageinspect.html#id-1.11.7.34.6

> This is a B-tree leaf page. All tuples that point to the table happen to be posting list tuples (all of which store a total of 100 6 byte TIDs).
> There is also a “high key” tuple at itemoffset number 1. ctid is used to store encoded information about each tuple in this example, though
> leaf page tuples often store a heap TID directly in the ctid field instead. tids is the list of TIDs stored as a posting list.

(all of which store a total of 100 6 byte TIDs)
I think the meaning is something like:
(all of which store a total of 100 TIDs, each TID is 6 byte long.)

 What's the meaning of  (16, 8292)?  After looking around. I'm still confused.
Would it be better to add an explanation about (16, 8292) to the docs?