I have not found these in the documentation (where they should be) but,...
I have found good examples for the current as well as the previous releases here:
http://www.wolfram.com/mathematica/new-in-11/
What's New page
For what's new in 10,9,8,7,6,... check the link titled "Features New in Previous Versions"
Also use the "Show Complete Wolfram Language input" link to copy the source(s) into your computing environment.