Manual: fix broken references
The manual contains a bunch of broken internal references that seems to occur when referencing something that does not have a natural anchor. For example
.. _quote-note:
.. note::
Note on Quotes
and
.. _VarianceDecomposition:
``VarianceDecomposition``
Decomposition of variance (unconditional variance, i.e. at
horizon infinity). [#f5]_
``VarianceDecompositionME``
Same as `VarianceDecomposition`_, but contains
do not work