docs: Clarify installation of lock file (#3686)

Signed-off-by: Julien Jerphanion <git@jjerphan.xyz>

README.md

@@ -72,7 +72,12 @@ See the [repoquery documentation](https://mamba.readthedocs.io/en/latest/user_gu
 
 `micromamba` can be used to install lock files generated by [conda-lock](https://conda.github.io/conda-lock/) without having to install `conda-lock`.
 
-Simply invoke e.g. `micromamba create -n my-env -f conda-lock.yml` with an environment lockfile named `*-lock.yml` or `*-lock.yaml`.
+Simply invoke `micromamba create` with the `-f` option, providing an environment lockfile whose name ends with
+`-lock.yml` or `-lock.yaml`; for instance:
+
+```bash
+micromamba create -n my-env -f conda-lock.yml
+```
 
 ### setup-micromamba (setup-miniconda replacement)
 

docs/source/user_guide/micromamba.rst

@@ -268,6 +268,8 @@ These files are named ``conda-lock.yml`` by default, and look like:
       category: main
       optional: false
 
+In order to YAML files to be considered as ``conda-lock`` files, their name must ends with ``-lock.yml`` or ``-lock.yaml``.
+
 To install such a file with ``micromamba``, just pass the ``-f`` flag again:
 
 .. code::