docs: prefer lowercase html tags

Signed-off-by: Brian Paul <brianp@vmware.com>
diff --git a/docs/download.html b/docs/download.html
index 207d879..3d54328 100644
--- a/docs/download.html
+++ b/docs/download.html
@@ -21,7 +21,7 @@
 </p>
 
 
-<H1>Unpacking</H1>
+<h1>Unpacking</h1>
 
 <p>
 Mesa releases are available in three formats: .tar.bz2, .tar.gz, and .zip
@@ -80,7 +80,7 @@
 </p>
 
 
-<H1>Demos and GLUT</H1>
+<h1>Demos and GLUT</h1>
 
 <p>
 A package of Mark Kilgard's GLUT library is available