Update runing-coreos/platforms/vmware/index.md
Update runing-coreos/platforms/vmware/index.md

The old link (https://developercenter.vmware.com/tool/ovf/3.5.0) pointed to a 404, changing to the tool's generic homepage (https://developercenter.vmware.com/tool/ovf/) which looks exactly the same as the previous link, but doesn't need to be updated every time VMWare pushs an update.
wli6/docs,mischief/coreos-docs,ionave/docs,marineam/coreos-docs,mjg59/docs,coreos/docs,michelleN/docs,robszumski/docs,bq-xiao/docs,joshix/docs,jdloft/docs,ksmaheshkumar/docs-2,skynet/docs,atxwebs/docs,hkjn/docs-1,iankronquist/docs,jonboulle/docs,endocode/coreos-docs