Commented out header with no section body. Will write this eventually.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42844 91177308-0d34-0410-b5e6-96231b3b80d8

docs/InternalsManual.html

@@ -596,8 +596,9 @@ block B4 (i.e., B4.2).  In this manner, conditions for control-flow
 (which also includes conditions for loops and switch statements) are
 hoisted into the actual basic block.</p>
 
-
+<!--
 <h4>Implicit Control-Flow</h4>
+-->
 
 <!--
 <p>A key design principle of the <tt>CFG</tt> class was to not require