docs: Redefine Heading elements as below;

H1 ... Title (and might be Chapter in future)
H2 ... Section
H3 ... Subsection
H4 ... Sub-subsection

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129683 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/GCCFEBuildInstrs.html b/docs/GCCFEBuildInstrs.html
index 705e238..6714a49 100644
--- a/docs/GCCFEBuildInstrs.html
+++ b/docs/GCCFEBuildInstrs.html
@@ -24,7 +24,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<h1><a name="instructions">Building llvm-gcc from Source</a></h1>
+<h2><a name="instructions">Building llvm-gcc from Source</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -67,7 +67,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<h1><a name="ada">Building the Ada front-end</a></h1>
+<h2><a name="ada">Building the Ada front-end</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -233,7 +233,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<h1><a name="fortran">Building the Fortran front-end</a></h1>
+<h2><a name="fortran">Building the Fortran front-end</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -247,7 +247,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<h1><a name="license">License Information</a></h1>
+<h2><a name="license">License Information</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">