message: Minor fixes in reference.rst
diff: @@ -72,6 +72,9 @@ Just-in-time compilation
  .. autofunction:: schedule
  .. autofunction:: eval
  .. autofunction:: printf_async
  +.. autofunction:: graphviz
  +.. autofunction:: label
  +.. autofunction:: set_label
  Type traits
  -----------
  @@ -582,6 +585,7 @@ Automatic differentiation
  .. autofunction:: suspend_grad
  .. autofunction:: resume_grad
  .. autofunction:: isolate_grad
  +.. autofunction:: graphviz_ad
  .. autoclass:: CustomOp
  @@ -1117,11 +1121,3 @@ _______________________________________________________________________
  :show-inheritance:
  .. autoclass:: drjit.llvm.ad.ArrayXi64
  :show-inheritance:
  -
  -Miscellaneous
  --------------
  -
  -.. autofunction:: graphviz
  -.. autofunction:: graphviz_ad
  -.. autofunction:: label
  -.. autofunction:: set_label
  \ No newline at end of file
  