fix typo in gawk url's

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@1686 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter04/gawk.xml

@@ -1,4 +1,4 @@
 Gawk (&gawk-version;) - &gawk-size;:
-<ulink url="&ftp;/gawk&gawk-version;.tar.bz2">&ftp;/gawk&gawk-version;.tar.bz2</ulink>
-<ulink url="&http;/gawk&gawk-version;.tar.bz2">&http;/gawk&gawk-version;.tar.bz2</ulink>
+<ulink url="&ftp;/gawk-&gawk-version;.tar.bz2">&ftp;/gawk-&gawk-version;.tar.bz2</ulink>
+<ulink url="&http;/gawk-&gawk-version;.tar.bz2">&http;/gawk-&gawk-version;.tar.bz2</ulink>