update docs

docs/source/user-guide.rst

@@ -235,7 +235,7 @@ LeanDojo's behavior can be configured through the following environment variable
 * :code:`CONTAINER`: The container used for running LeanDojo. Default to :code:`docker` but also supports :code:`native`, i.e., running without any container. See :ref:`running-without-docker`.
 * :code:`TACTIC_CPU_LIMIT`: Number of CPUs for executing tactics (see the `--cpus` flag of `docker run <https://docs.docker.com/engine/reference/commandline/run/#memory>`_) when interacting with Lean (only applicable when :code:`CONTAINER=docker`). Default to 1.
 * :code:`TACTIC_MEMORY_LIMIT`: Maximum memory when interacting with Lean (see the `--memory` flag of `docker run <https://docs.docker.com/engine/reference/commandline/run/#memory>`_) (only applicable when :code:`CONTAINER=docker`). Default to 16 GB.
-* :code:`GITHUB_ACCESS_TOKEN`: GitHub `personal access token <https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens#creating-a-personal-access-token-classic>`_ for using the GitHub API. They are optional. If provided, they can increase the API rate limit. See `here <https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting>`_ for details.
+* :code:`GITHUB_ACCESS_TOKEN`: GitHub `personal access token <https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens#creating-a-personal-access-token-classic>`_ for using the GitHub API. They are optional. If provided, they can increase the `API rate limit <https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting>`_.
 * :code:`VERBOSE` or :code:`DEBUG`: Setting either of them to any value will cause LeanDojo to print debug information. Not set by default.