Fix config.sample.php documentation

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

config/config.sample.php

@@ -902,10 +902,6 @@ $CONFIG = array(
  *  - OC\Preview\TIFF
  *  - OC\Preview\Font
  *
- * .. note:: Troubleshooting steps for the MS Word previews are available
- *    at the :doc:`../configuration_files/collaborative_documents_configuration`
- *    section of the Administrators Manual.
- *
  * The following providers are not available in Microsoft Windows:
  *
  *  - OC\Preview\Movie
@@ -1262,7 +1258,7 @@ $CONFIG = array(
  *
  * If you want to convert an existing 3-byte setup into a 4-byte setup please
  * set the parameters in MySQL as mentioned below and run the migration command:
- *  ./occ db:convert-mysql-charset
+ * ./occ db:convert-mysql-charset
  * The config setting will be set automatically after a successful run.
  *
  * Consult the documentation for more details.