added CDATA to the content node in docs/rss.php
added CDATA to the content node in docs/rss.php

To resolve issues with code samples.

bordar/mwEmbed,FlixMaster/mwEmbed,safarijv/mwEmbed,kaltura/mwEmbed,matsuu/mwEmbed,abaylis/mwEmbed,DBezemer/mwEmbed,omridevk/mwEmbed,alexmilk/mwEmbed,bordar/mwEmbed,FlixMaster/mwEmbed,slash851/mwEmbed,joanpuigsanz/mwEmbed,panda-os/mwEmbed,abaylis/mwEmbed,joanpuigsanz/mwEmbed,matsuu/mwEmbed,panda-os/mwEmbed,matsuu/mwEmbed,tanyaLibatter/mwEmbed,DBezemer/mwEmbed,bordar/mwEmbed,tanyaLibatter/mwEmbed,kaltura/mwEmbed,slash851/mwEmbed,safarijv/mwEmbed,vladm3/mwEmbed,abaylis/mwEmbed,alexmilk/mwEmbed,SVSG/mwEmbed,panda-os/mwEmbed,vladm3/mwEmbed,bordar/mwEmbed,DBezemer/mwEmbed,slash851/mwEmbed,slash851/mwEmbed,abaylis/mwEmbed,omridevk/mwEmbed,SVSG/mwEmbed,FlixMaster/mwEmbed,kaltura/mwEmbed,safarijv/mwEmbed,safarijv/mwEmbed,omridevk/mwEmbed,alexmilk/mwEmbed,vladm3/mwEmbed,kaltura/mwEmbed,DBezemer/mwEmbed,joanpuigsanz/mwEmbed,vladm3/mwEmbed,FlixMaster/mwEmbed,SVSG/mwEmbed,tanyaLibatter/mwEmbed,matsuu/mwEmbed,tanyaLibatter/mwEmbed,panda-os/mwEmbed,alexmilk/mwEmbed,SVSG/mwEmbed,omridevk/mwEmbed,joanpuigsanz/mwEmbed