Building the docs with own changes

[John Colvin via Digitalmars-d]

Is there any non-insane way of changing some documentation in a 
module and checking that any links/xrefs you may have added 
actually work?

The dlang.org makefile appears to happily erase uncommitted 
changes in ../druntime and ../phobos. I'm really struggling for 
words to describe how infuriating that is. I ran make and it 
deleted my work in a separate folder. Not OK.