docs: update page format to specify page checksum field

Backpatch to 9.3

Per report from Steffen Hildebrandt

diff --git a/doc/src/sgml/storage.sgml b/doc/src/sgml/storage.sgml
index 6cc0e9cbcd64e8d6847eb0e1838623a164b6c7b4..09b3f1028c120a7433bd5917886bfa113726191c 100644 (file)
--- a/doc/src/sgml/storage.sgml
+++ b/doc/src/sgml/storage.sgml
@@ -672,10 +672,10 @@ data. Empty in ordinary tables.
    to this page
   
   
-   pd_tli
+   pd_checksum
    uint16
    2 bytes
-   TimeLineID of last change (only its lowest 16 bits)
+   Page checksum
   
   
    pd_flags