docs(pytest-plugin): Fix refs

Author: tony

docs/pytest-plugin.md

@@ -52,13 +52,13 @@ These are fixtures are automatically used when the plugin is enabled and `pytest
 
 ## Setting a tmux configuration
 
-If you would like :func:`session` fixture to automatically use a configuration, you have a few
+If you would like {func}`session fixture <libtmux.pytest_plugin.session>` to automatically use a configuration, you have a few
 options:
 
-- Pass a `config_file` into :class:`libtmux.server.Server`
+- Pass a `config_file` into {class}`~libtmux.server.Server`
 - Set the `HOME` directory to a local or temporary pytest path with a configurat configuration file
 
-You could also read the code and override :func:`server`'s fixture in your own doctest. doctest.
+You could also read the code and override {func}`server fixtures <libtmux.pytest_plugin.server>`'s in your own doctest. doctest.
 
 (set_home)=