fix level on headers in documentation index

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2203 44740490-163a-0410-bde0-09ae8108e29a

docs/index.txt

@@ -38,15 +38,15 @@ Documentation for simpleSAMLphp developers:
 
  * [Error handling in simpleSAMLphp](simplesamlphp-errorhandling)
 
-### Externally contributed documentation
+## Externally contributed documentation
 
   * [Notes on using SimpleSAMLphp SP and Shibboleth IdP using SAML 2.0](http://www.zeitoun.net/articles/configure-simplesaml-1.3-sp-and-shibboleth-2.1-idp/start)
 
-### Video tutorials
+## Video tutorials
 
  * [Installation, configuration and test login with Feide (approx 8 minutes)](http://rnd.feide.no/content/video-tutorial-installing-and-configuring-simplesamlphp)
 
-### Community help and support
+## Community help and support
 
  * [Please join the mailinglist](http://rnd.feide.no/content/simplesamlphp-users-mailinglist)
  * [The simpleSAMLphp wiki](https://ow.feide.no/simplesamlphp:start) contains information about different setup of simpleSAMLphp. In example eduGAIN setup, common errors, linux setup, shibboleth installation etc.