sane-find-scanner is in section 1 not 5.

man/sane-usb.5.html

@@ -33,7 +33,7 @@
 <H2>QUICK START</H2><PRE>
        This is a short HOWTO-like section. For the full details, read the fol-
        lowing  sections.  The  goal  of  this  section  is  to get the scanner
-       detected by <B><A HREF="sane-find-scanner.5.html">sane-find-scanner(5)</A></B>.
+       detected by <B><A HREF="sane-find-scanner.1.html">sane-find-scanner(1)</A></B>.
 
        Run sane-find-scanner. If it lists your scanner with the correct vendor
        and  product  ids, you are done. See section <B>SANE</B> <B>ISSUES</B> for details on