Add anchor

Author: tomschr

docs/source/user/config/environment.rst

@@ -1,3 +1,5 @@
+.. _config-show-env:
+
 Showing Env's Configuration
 ===========================
 
@@ -20,4 +22,4 @@ current project's directory.
 .. note::
 
    An example of an environment configuration file is provided in this repo
-   in the :gh_path:`etc/docbuild/env.example.toml` directory.
+   in the :gh_path:`etc/docbuild/env.example.toml` directory.