SimpleDocs is a paclet designed to make simplified Mathematica documentation that will always be cross version compatible and can easily be converted to Markdown to be shared on the web.
The easiest way to install Ems is using a paclet server installation:
PacletInstall[
"SimpleDocs",
"Site"->
"http://www.wolframcloud.com/objects/b3m2a1.paclets/PacletServer"
]If you've already installed it you can update using:
PacletUpdate[
"SimpleDocs",
"Site"->
"http://www.wolframcloud.com/objects/b3m2a1.paclets/PacletServer"
]Alternately you can download this repo as a ZIP file and put extract it in $UserBaseDirectory/Applications