Update links on 4 Idioms pages from mitre.org to thier correct urls
Update links on 4 Idioms pages from mitre.org to thier correct urls

Updated links from mitre.org to their correct urls, plus made some other minor copy edits, to the following 4 pages:

http://stixproject.github.io/documentation/idioms/maec-malware/
http://stixproject.github.io/documentation/idioms/cve/
http://stixproject.github.io/documentation/idioms/openioc-test-mechanism/
http://stixproject.github.io/documentation/idioms/leveraged-ttp/
johnwunder/johnwunder.github.io,jburns12/stixproject.github.io,johnwunder/johnwunder.github.io,jburns12/stixproject.github.io,jburns12/stixproject.github.io,STIXProject/stixproject.github.io,STIXProject/stixproject.github.io,STIXProject/stixproject.github.io,STIXProject/stixproject.github.io,johnwunder/johnwunder.github.io,jburns12/stixproject.github.io,johnwunder/johnwunder.github.io