Clarify treatment of intial white space by %% conversion specification.

as per http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=435648.

man3/scanf.3

@@ -47,7 +47,7 @@
 .\"     Add ERRORS section.
 .\"     Document the 'a' and 'm' modifiers for dynamic string allocation.
 .\"
-.TH SCANF 3  2008-06-23 "GNU" "Linux Programmer's Manual"
+.TH SCANF 3  2008-07-08 "GNU" "Linux Programmer's Manual"
 .SH NAME
 scanf, fscanf, sscanf, vscanf, vsscanf, vfscanf \- input format conversion
 .SH SYNOPSIS
@@ -213,7 +213,7 @@ An optional decimal integer which specifies the
 .IR "maximum field width" .
 Reading of characters stops either when this maximum is reached or
 when a non-matching character is found, whichever happens first.
-Most conversions discard initial whitespace characters (the exceptions
+Most conversions discard initial white space characters (the exceptions
 are noted below),
 and these discarded characters don't count towards the maximum field width.
 String input conversions store a null terminator (\(aq\\0\(aq)
@@ -375,8 +375,8 @@ That is,
 .B %\&%
 in the format string matches a
 single input \(aq%\(aq character.
-No conversion is done, and assignment does not
-occur.
+No conversion is done (but initial white space characters are discarded),
+and assignment does not occur.
 .TP
 .B d
 Matches an optionally signed decimal integer;