just tickle a file to for build cms-master. I dont seem to have the rights to…

just tickle a file to for build cms-master. I dont seem to have the rights to force a jenkins build.

doc/mongo.md

 # Notes on using mongodb backed LMS and CMS
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 These are some random notes for developers, on how things are stored in mongodb, and how to debug mongodb data.
 
 ## Databases