Use proper reference to Python exception in Vertex.get method docst…

…ring

Co-authored-by: Steven Elliott <[email protected]>
Signed-off-by: Mitch Negus <[email protected]>

src/firewheel/control/experiment_graph.py

@@ -733,7 +733,7 @@ def get(self, key, default=None):
             The value of the requested attribute if the attribute is in
             the set of available attributes, else ``default``. If
             ``default`` is not given, it defaults to :py:data:`None`, so
-            that this method never raises a `KeyError`.
+            that this method never raises a :py:exc:`KeyError`.
 
         Raises:
             RuntimeError: If the :py:class:`Vertex` is not :py:attr:`Vertex.valid`.