docs: Introduce cascading style <div> and <p> continued on <h[2-5]>.

<h2>Section Example</h2>
<div> <!-- h2+div is applied -->
<p>Section preamble.</p>

<h3>Subsection Example</h3>
<p> <!-- h3+p is applied -->
Subsection body
</p>

<!-- End of section body -->
</div>

FIXME: Care H5 better.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130040 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ExtendingLLVM.html b/docs/ExtendingLLVM.html
index 7f77bb7..b720911 100644
--- a/docs/ExtendingLLVM.html
+++ b/docs/ExtendingLLVM.html
@@ -36,7 +36,7 @@
 </h2>
 <!-- *********************************************************************** -->
 
-<div class="doc_text">
+<div>
 
 <p>During the course of using LLVM, you may wish to customize it for your
 research project or for experimentation. At this point, you may realize that
@@ -73,7 +73,7 @@
 </h2>
 <!-- *********************************************************************** -->
 
-<div class="doc_text">
+<div>
 
 <p>Adding a new intrinsic function to LLVM is much easier than adding a new
 instruction.  Almost all extensions to LLVM should start as an intrinsic
@@ -135,7 +135,7 @@
 </h2>
 <!-- *********************************************************************** -->
 
-<div class="doc_text">
+<div>
 
 <p>As with intrinsics, adding a new SelectionDAG node to LLVM is much easier
 than adding a new instruction.  New nodes are often added to help represent
@@ -225,7 +225,7 @@
 </h2>
 <!-- *********************************************************************** -->
 
-<div class="doc_text">
+<div>
 
 <p><span class="doc_warning">WARNING: adding instructions changes the bitcode
 format, and it will take some effort to maintain compatibility with
@@ -282,20 +282,18 @@
 </h2>
 <!-- *********************************************************************** -->
 
-<div class="doc_text">
+<div>
 
 <p><span class="doc_warning">WARNING: adding new types changes the bitcode
 format, and will break compatibility with currently-existing LLVM
 installations.</span> Only add new types if it is absolutely necessary.</p>
 
-</div>
-
 <!-- ======================================================================= -->
 <h3>
   <a name="fund_type">Adding a fundamental type</a>
 </h3>
 
-<div class="doc_text">
+<div>
 
 <ol>
 
@@ -321,7 +319,7 @@
   <a name="derived_type">Adding a derived type</a>
 </h3>
 
-<div class="doc_text">
+<div>
 
 <ol>
 <li><tt>llvm/include/llvm/Type.h</tt>:
@@ -373,6 +371,8 @@
 
 </div>
 
+</div>
+
 <!-- *********************************************************************** -->
 
 <hr>