Add S-tree doc for possible future use.

diff --git a/doc/src/sgml/S-Tree_indexes.html.gz b/doc/src/sgml/S-Tree_indexes.html.gz
new file mode 100644 (file)
index 0000000..c19f0e4
Binary files /dev/null and b/doc/src/sgml/S-Tree_indexes.html.gz differ