Even this question is a few years old and it was specifically for Visual Studio 2010. For all those that land here by Google, I would like to add an answer that I found and that holds true for Visual Studio 2015 in combination with Sandcastle Help File Builder (SHFB):
/// <inheritdoc/>
can be used to inherit the docs from a base class or an interface.
Here a link to the Sandcastle Help File Builder (SHFB) documentation:
Using the <inheritdoc /> Tag