Update documentation.rst

Updated the sphinx and breathe versions

docs/sphinx/contributing/documentation.rst

@@ -24,9 +24,9 @@ To build the |hpx| documentation, you need recent versions of the following
 packages:
 
 - ``python3``
-- ``sphinx 4.5.0`` (Python package)
+- ``sphinx 5.3.0`` (Python package)
 - ``sphinx-book-theme`` (Python package)
-- ``breathe 4.33.1`` (Python package)
+- ``breathe 4.35.0`` (Python package)
 - ``doxygen``
 - ``sphinxcontrib-bibtex``
 - ``sphinx-copybutton``
@@ -36,7 +36,7 @@ manager, you can install them using the Python package manager ``pip``:
 
 .. code-block:: bash
 
-   pip install --user "sphinx<5" sphinx-book-theme breathe sphinxcontrib-bibtex sphinx-copybutton
+   pip install --user "sphinx=5.3" sphinx-book-theme breathe sphinxcontrib-bibtex sphinx-copybutton
 
 You may need to set the following CMake variables to make sure CMake can
 find the required dependencies.