Fixes markdown formatting in Vagrant documentation.
Fixes markdown formatting in Vagrant documentation.

Reviewed at https://reviews.apache.org/r/29426/

kidaa/aurora,protochron/aurora,wfarner/aurora,kidaa/aurora,medallia/aurora,wfarner/aurora,kidaa/aurora,wfarner/aurora,rdelval/aurora,rosmo/aurora,protochron/aurora,rosmo/aurora,rosmo/aurora,medallia/aurora,crashlytics/aurora,rosmo/aurora,rosmo/aurora,medallia/aurora,rdelval/aurora,mschenck/aurora,kidaa/aurora,crashlytics/aurora,protochron/aurora,crashlytics/aurora,thinker0/aurora,thinker0/aurora,shahankhatch/aurora,wfarner/aurora,rosmo/aurora,shahankhatch/aurora,mschenck/aurora,crashlytics/aurora,apache/aurora,apache/aurora,thinker0/aurora,mschenck/aurora,shahankhatch/aurora,mschenck/aurora,mschenck/aurora,thinker0/aurora,medallia/aurora,rdelval/aurora,kidaa/aurora,crashlytics/aurora,medallia/aurora,thinker0/aurora,kidaa/aurora,shahankhatch/aurora,shahankhatch/aurora,apache/aurora,wfarner/aurora,protochron/aurora,rdelval/aurora,apache/aurora,mschenck/aurora,thinker0/aurora,protochron/aurora,protochron/aurora,shahankhatch/aurora,rdelval/aurora,apache/aurora,crashlytics/aurora,medallia/aurora,apache/aurora,wfarner/aurora,rdelval/aurora