This is a Sphinx extension which recognizes the .. versionremoved:: and .. removed-in:: directives. These are missing from Sphinx'es core markup.

Use pip to install from PyPI:

pip install sphinx-removed-in

Configure your conf.py:

# Add any Sphinx extension module names here, as strings. They can be extensions
# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
extensions = ['sphinx_removed_in']

Source code and issue tracker are at https://github.com/MrSenko/sphinx-removed-in