pixma_bjnp.c sane-pixma.doc Fix trailing spaces

doc/sane-pixma.man

@@ -300,7 +300,7 @@ and MFNP protocols.
 Canon seems to be dropping support for these protocols in recent scanners.
 To verify if your scanner supports one of these protocols, check the content of
 the _scanner._tcp service entry in mDNS/DNS-SD (using for example  avahi-discover).
-If that does not list port 8610 
+If that does not list port 8610.
 or 8612 your scanner pobably does not support the mfmp or bjnp protols.
 .PP
 Both IPv4 and IPv6 are supported, but IPv6 is as