docs: prefer lowercase html tags

Signed-off-by: Brian Paul <brianp@vmware.com>
diff --git a/docs/devinfo.html b/docs/devinfo.html
index 06322d1..c4b7194 100644
--- a/docs/devinfo.html
+++ b/docs/devinfo.html
@@ -53,7 +53,7 @@
 
 
 
-<H2>Coding Style</H2>
+<h2>Coding Style</h2>
 
 <p>
 Mesa's code style has changed over the years.  Here's the latest.
@@ -149,20 +149,20 @@
 </p>
 
 
-<H2>Making a New Mesa Release</H2>
+<h2>Making a New Mesa Release</h2>
 
 <p>
 These are the instructions for making a new Mesa release.
 </p>
 
-<H3>Get latest source files</H3>
+<h3>Get latest source files</h3>
 <p>
 Use git to get the latest Mesa files from the git repository, from whatever
 branch is relevant.
 </p>
 
 
-<H3>Verify and update version info</H3>
+<h3>Verify and update version info</h3>
 <p>
 Create/edit the docs/relnotes-x.y.html file to document what's new in the release.
 Add the new relnotes-x.y.html file to <a href="relnotes.html">relnotes.html</a>.
@@ -193,7 +193,7 @@
 </p>
 
 
-<H3>Make the tarballs</H3>
+<h3>Make the tarballs</h3>
 <p>
 Make the distribution files.  From inside the Mesa directory:
 <pre>
@@ -211,7 +211,7 @@
 compile everything, and run some demos to be sure everything works.
 </p>
 
-<H3>Update the website and announce the release</H3>
+<h3>Update the website and announce the release</h3>
 <p>
 Follow the directions on SourceForge for creating a new "release" and
 uploading the tarballs.