Typo ...is set for -> is set.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@341 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter02/aboutlfs.xml

@@ -46,7 +46,7 @@ be damaged
 <para>
 One way to make sure that $LFS is set at all times is adding it to
 the /root/.bash_profile and/or /root/.bashrc file(s) so that every time a
-'su' to root is done to install LFS, the $LFS variable is set for.
+'su' to root is done to install LFS, the $LFS variable is set.
 </para>
 
 </sect1>