Add mention of "C library/kernel ABI differences" subsections

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
diff --git a/todo.html b/todo.html
index 2738d41..6b116fa 100644
--- a/todo.html
+++ b/todo.html
@@ -144,7 +144,7 @@
             and attempt (i.e., it's the goal, but not all pages do this well)
             to include NOTES that describe differences in the
             underlying system call.
-            (For example, see the "Linux Notes" in the
+            (For example, see the "C library/kernel ABI differences" in the
             <a href="http://man7.org/linux/man-pages//man2/select.2.html#NOTES">NOTES
             section of <em>select(2)</em></a>.)
             <br>