mention the maybe-missing initial zero in the vernum output

docs/curl-config.1

@@ -2,7 +2,7 @@
 .\" nroff -man curl-config.1
 .\" Written by Daniel Stenberg
 .\"
-.TH curl-config 1 "8 Oct 2002" "Curl 7.10" "curl-config manual"
+.TH curl-config 1 "11 Dec 2004" "Curl 7.10" "curl-config manual"
 .SH NAME
 curl-config \- Get information about a libcurl installation
 .SH SYNOPSIS
@@ -38,7 +38,8 @@ Outputs version information about the installed libcurl.
 Outputs version information about the installed libcurl, in numerical mode.
 This outputs the version number, in hexadecimal, with 8 bits for each part;
 major, minor, patch. So that libcurl 7.7.4 would appear as 070704 and libcurl
-12.13.14 would appear as 0c0d0e...
+12.13.14 would appear as 0c0d0e... Note that the initial zero might be
+omitted.
 .SH "EXAMPLES"
 What linker options do I need when I link with libcurl?