Fix typo in sed command

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10938 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter05/ncurses.xml

@@ -45,7 +45,7 @@
 
     <para>First, ensure that gawk is found first during configuration:</para>
 
-<screen><userinput remap="pre">sed s/mawk// configure</userinput></screen>
+<screen><userinput remap="pre">sed -i s/mawk// configure</userinput></screen>
 
     <para>Prepare Ncurses for compilation:</para>