Fix shellcheck reference

jakirkham · web-flow · commit 6771e11e15a3 · 2023-03-07T00:28:55.000-08:00
diff --git a/src/maintainer/conda_forge_yml.rst b/src/maintainer/conda_forge_yml.rst
@@ -458,7 +458,7 @@ channel_alias if no prefix is given.
 
     remote_ci_setup: "conda-forge-ci-setup=3"
 
-.. shellcheck:
+.. _shellcheck:
 
 shellcheck
 -----------
