Add documentation to invoke_fused and friends NFC. #2611
Thanks for working on this. This is much appreciated!
In order to get this into the docs you will have to add the file to the list of files parsed by doxygen (see here: https://github.com/STEllAR-GROUP/hpx/blob/master/docs/CMakeLists.txt#L46-L174). Also, you may want to consider creating a documentation index entry (http://stellar-group.github.io/hpx/docs/html/index/s05.html) for
Also, if we start adding doxygen comments for those functions, it might be nice to add descriptions for what the function is doing and for the function argument values as well (see doxygen