Typo

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9218 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

prologue/why.xml

@@ -169,7 +169,7 @@
       <listitem>
         <para>GMP</para>
 
-        <para>This package contains math libraries and have useful functions for
+        <para>This package contains math libraries and has useful functions for
         arbitrary precision arithmetic.  It is required to build Gcc. </para>
       </listitem>