Docs: fix two broken links (#6246)

Author: aeriforme

Docs/source/usage/parameters.rst

@@ -1075,7 +1075,7 @@ Particle initialization
       If the external file also contains ``openPMD::Records`` for ``mass`` and ``charge`` (constant `double` scalars) then the species will use these, unless overwritten in the input file (see ``<species_name>.mass``, ``<species_name>.charge`` or ``<species_name>.species_type``).
       The ``external_file`` option is currently implemented for 2D, 3D and RZ geometries, with record components in the cartesian coordinates ``(x,y,z)`` for 3D and RZ, and ``(x,z)`` for 2D.
       For more information on the `openPMD format <https://github.com/openPMD>`__ and how to build WarpX with it, please visit :ref:`the install section <install-developers>`.
-      See `this file <https://github.com/BLAST-WarpX/WarpX/Examples/Tests/gaussian_beam/inputs_test_3d_focusing_gaussian_beam_from_openpmd_prepare.py>`__
+      See `this file <https://github.com/BLAST-WarpX/warpx/blob/development/Examples/Tests/gaussian_beam/inputs_test_3d_focusing_gaussian_beam_from_openpmd_prepare.py>`__
       for an example of how to prepare the openPMD data file.
 
     * ``NFluxPerCell``: Continuously inject a flux of macroparticles from a surface. The emitting surface can be chosen to be either a plane
@@ -1173,7 +1173,7 @@ Particle initialization
       An additional parameter, indicating the path of an openPMD data file,
       ``<species_name>.read_density_from_path`` must be specified. The openPMD
       file must contain a field named ``density``. See
-      `this file <https://github.com/BLAST-WarpX/WarpX/Examples/Tests/load_density/inputs_test_3d_load_density_prepare.py>`__
+      `this file <https://github.com/BLAST-WarpX/warpx/blob/development/Examples/Tests/load_density/inputs_test_3d_load_density_prepare.py>`__
       for an example of how to prepare the openPMD data file.
 
 * ``<species_name>.flux_profile`` (`string`)