chore: use anonymous reference to suppress duplicate warning

docs/source/addingsolver.rst

@@ -41,7 +41,7 @@ After that we define our new object:
 
     class CG(Solver):
 
-followed by a `numpydoc docstring <https://numpydoc.readthedocs.io/en/latest/format.html/>`_
+followed by a `numpydoc docstring <https://numpydoc.readthedocs.io/en/latest/format.html/>`__
 (starting with ``r"""`` and ending with ``"""``) containing the documentation of the solver. Such docstring should
 contain at least a short description of the solver, a ``Parameters`` section with a description of the
 input parameters of the associated ``_init__`` method and a ``Notes`` section providing a reference to the original
@@ -239,7 +239,7 @@ adheres to the guidelines of PyLops:
 
 - the new class contains at least ``__init__``, ``setup``, ``step``, ``run``, ``finalize``, and ``solve`` methods.
 
-- each of the above methods have a `numpydoc docstring <https://numpydoc.readthedocs.io/>`_ documenting
+- each of the above methods have a `numpydoc docstring <https://numpydoc.readthedocs.io/>`__ documenting
   at least the input ``Parameters`` and the ``__init__`` method contains also a ``Notes`` section providing a
   mathematical explanation of the solver.