docs: fix a few typos

Noticed a couple, found the rest using vimspell.

Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/docs/egl.html b/docs/egl.html
index c22aa4a..17823c2 100644
--- a/docs/egl.html
+++ b/docs/egl.html
@@ -44,7 +44,7 @@
 
 <p>The main library and OpenGL is enabled by default.  The first two options
 above enables <a href="opengles.html">OpenGL ES 1.x and 2.x</a>.  The last two
-options enables the listed classic and and Gallium drivers respectively.</p>
+options enables the listed classic and Gallium drivers respectively.</p>
 
 </li>