The grid layer provides a mapping from URI to data. To turn this into a graph
of directories and files, the "vdrive" layer (which sits on top of the grid
layer) needs to keep track of "directory nodes", or "dirnodes" for short.
-`docs/dirnodes.rst <../dirnodes.rst>`_ describes how these work.
+`<dirnodes.rst>`_ describes how these work.
Dirnodes are contained inside mutable files, and are thus simply a particular
way to interpret the contents of these files. As a result, a directory