docs: spell out faq in sidebar

We're not short on space here, so there's little point in abbreviating
this. This also matches the heading in the article.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>

docs/contents.html

@@ -34,7 +34,7 @@
 <li><a href="developers.html" target="_parent">Developers</a>
 <li><a href="systems.html" target="_parent">Platforms and Drivers</a>
 <li><a href="license.html" target="_parent">License and Copyright</a>
-<li><a href="faq.html" target="_parent">FAQ</a>
+<li><a href="faq.html" target="_parent">Frequently Asked Questions</a>
 <li><a href="relnotes.html" target="_parent">Release Notes</a>
 <li><a href="thanks.html" target="_parent">Acknowledgements</a>
 <li><a href="conform.html" target="_parent">Conformance Testing</a>