fix validator errors

llvm-svn: 66688

llvm/docs/tutorial/LangImpl4.html

@@ -87,7 +87,7 @@ entry:
 </pre>
 </div>
 
-Constant folding, as seen above, in particular, is a very common and very
+<p>Constant folding, as seen above, in particular, is a very common and very
 important optimization: so much so that many language implementors implement
 constant folding support in their AST representation.</p>
 

llvm/docs/tutorial/OCamlLangImpl1.html

@@ -277,7 +277,7 @@ and lex_ident buffer = parser
 </pre>
 </div>
 
-Numeric values are similar:</p>
+<p>Numeric values are similar:</p>
 
 <div class="doc_code">
 <pre>