[patch] printf.3: Fix description of %a hexfloat output

[Jonathan Wakely <jwakely@redhat.com>]

The description of hexadecimal floating-point output is missing a
character describing the exponent. The guarantee of at least one digit
in the exponent is present in both C99 and POSIX.

diff --git a/man3/printf.3 b/man3/printf.3
index 18000bc70..d3510f7df 100644
--- a/man3/printf.3
+++ b/man3/printf.3
@@ -730,7 +730,7 @@ conversion, the
 .I double
 argument is converted to hexadecimal notation (using the letters abcdef)
 in the style
-.RB [\-] 0x h \&. hhhh p \(+-;
+.RB [\-] 0x h \&. hhhh p \(+-d;
 for
 .B A
 conversion the prefix
@@ -746,6 +746,8 @@ and otherwise is sufficiently large to distinguish values of type
 .IR double .
 The digit before the decimal point is unspecified for nonnormalized
 numbers, and nonzero but otherwise unspecified for normalized numbers.
+The exponent always contains at least one
+digit; if the value is zero, the exponent is 0.
 .TP
 .B c
 If no