docs: harmonize headings and titles

We're pretty insonsistent in what the headings and titles are, especially
compared to what the articles are listed as in the sidebar. Let's
harmonize this.

There's a notable exception for meson.html, where the sidebar uses a
short-hand form that makes sense in the sidebar, but not in the article
due to the visible context being different.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
diff --git a/docs/meson.html b/docs/meson.html
index ad954c1..32ed59e 100644
--- a/docs/meson.html
+++ b/docs/meson.html
@@ -2,7 +2,7 @@
 <html lang="en">
 <head>
   <meta http-equiv="content-type" content="text/html; charset=utf-8">
-  <title>Compilation and Installation using Meson</title>
+  <title>Compilation and Installation Using Meson</title>
   <link rel="stylesheet" type="text/css" href="mesa.css">
 </head>
 <body>
@@ -14,7 +14,7 @@
 <iframe src="contents.html"></iframe>
 <div class="content">
 
-<h1>Compilation and Installation using Meson</h1>
+<h1>Compilation and Installation Using Meson</h1>
 
 <ul>
   <li><a href="#intro">Introduction</a></li>