Add "Author Date Id Revision" svn:keyword properties to these files, as

is done with the other html files in doc, to hopefully keep strings like
"Last modified" current.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95225 91177308-0d34-0410-b5e6-96231b3b80d8

docs/tutorial/LangImpl8.html

@@ -359,7 +359,7 @@ Passing Style</a> and the use of tail calls (which LLVM also supports).</p>
 
   <a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
   <a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
-  Last modified: $Date: 2007-10-17 11:05:13 -0700 (Wed, 17 Oct 2007) $
+  Last modified: $Date$
 </address>
 </body>
 </html>