str: change example to match function being explained.
[ccan] / ccan / tdb2 / doc /
drwxr-xr-x   ..
-rw-r--r-- 37489 design-1.3.txt
-rw-r--r-- 66251 design.lyx
-rw-r--r-- 96597 design.lyx,v
-rw-r--r-- 240440 design.pdf
-rw-r--r-- 43934 design.txt