Fix documentation

Author: tobiasdiez

src/doc/en/developer/tools.rst

@@ -10,24 +10,24 @@ Additional development and testing tools
 
 Pytest
 ===============================
-`Pytest <https://docs.pytest.org/en/stable/>` is a testing framework.
+`Pytest <https://docs.pytest.org/en/stable/>`_ is a testing framework.
 At the moment, Sage is not yet using any tests based on pytest.
 
-*Installation:* ``pip install -U pytest``, see `documentation <https://docs.pytest.org/en/stable/getting-started.html#installation-and-getting-started>`_ for details.
+*Installation:* ``pip install -U pytest``, see `documentation <https://docs.pytest.org/en/stable/getting-started.html#installation-and-getting-started>`__ for details.
 *Usage:*
 - Manual: Run ``pytest path/to/the/test_file.py`` or ``pytest`` to run all tests (from a virtual environment with Sage installed)
-- VS Code: Install the `Python <https://marketplace.visualstudio.com/items?itemName=ms-python.python>`_ extension and follow the `offical documentation <https://code.visualstudio.com/docs/python/testing>`_.
+- VS Code: Install the `Python <https://marketplace.visualstudio.com/items?itemName=ms-python.python>`_ extension and follow the `offical VS Code documentation <https://code.visualstudio.com/docs/python/testing>`__.
 *Configuration:* ``conftest.py`` in the source folder
 *Documentation:* https://docs.pytest.org/en/stable/index.html
 
 Pyright 
 ===============================
-`Pyright <https://github.com/microsoft/pyright>` is static type checker.
+`Pyright <https://github.com/microsoft/pyright>`_ is static type checker.
 
-*Installation:* ``npm install -g pyright``, see `documentation <https://github.com/microsoft/pyright#installation>`_ for details.
+*Installation:* ``npm install -g pyright``, see `documentation <https://github.com/microsoft/pyright#installation>`__ for details.
 *Usage:*
 - Manual: Run ``pyright path/to/the/file.py``
-- VS Code: Install the `Pylance <https://marketplace.visualstudio.com/items?itemName=ms-python.vscode-pylance>`_ extension.
+- VS Code: Install the `Pylance <https://marketplace.visualstudio.com/items?itemName=ms-python.vscode-pylance>`__ extension.
 *Configuration:* ``pyrightconfig.json`` in the root
 *Note*: Currently, only the manifolds package is checked. Further packages can be added in the ``pyrightconfig.json`` file.
 *Documentation:* https://github.com/microsoft/pyright#documentation
@@ -39,7 +39,7 @@ Pycodestyle
 *Installation:* ``pip install -U pycodestyle --user``
 *Usage:*
 - Manual: Run ``pycodestyle path/to/the/file.py``
-- VS Code: Activate by adding the setting ``"python.linting.pycodestyleEnabled": true``, see `official VS Code documentation <https://code.visualstudio.com/docs/python/linting>`_ for details.
+- VS Code: Activate by adding the setting ``"python.linting.pycodestyleEnabled": true``, see `official VS Code documentation <https://code.visualstudio.com/docs/python/linting>`__ for details.
 *Configuration:* ``[pycodestyle]`` block in ``src/tox.ini``
 *Documentation:* https://pycodestyle.pycqa.org/en/latest/index.html