Fix name of LLVM CFE source tarball.

llvm-svn: 22110

Author: John Criswell

llvm/docs/CFEBuildInstrs.html

@@ -129,7 +129,7 @@
 </pre></li>
 
 <li><p>Unpack the C/C++ front-end source into cfrontend/src, either by
-       untar'ing an llvm-gcc.tar.gz file or checking out CVS into this
+       untar'ing a cfrontend.source.tar.gz file or checking out CVS into this
        directory.</p></li>
 
 <li><p>Make "build" and "install" directories as siblings of the "src" tree:</p>