docs: https all the links \o/

Most of them already redirected to https anyway, so we might as well
avoid the redirection and the security implications by linking directly
to the right protocol.

Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Brian Paul <brianp@vmware.com>
diff --git a/docs/opengles.html b/docs/opengles.html
index 24ad69f..2872b24 100644
--- a/docs/opengles.html
+++ b/docs/opengles.html
@@ -17,8 +17,8 @@
 <h1>OpenGL ES</h1>
 
 <p>Mesa implements OpenGL ES 1.1 and OpenGL ES 2.0.  More information about
-OpenGL ES can be found at <a href="http://www.khronos.org/opengles/">
-http://www.khronos.org/opengles/</a>.</p>
+OpenGL ES can be found at <a href="https://www.khronos.org/opengles/">
+https://www.khronos.org/opengles/</a>.</p>
 
 <p>OpenGL ES depends on a working EGL implementation.  Please refer to
 <a href="egl.html">Mesa EGL</a> for more information about EGL.</p>