add formatting documentation fix

docs/source/usage.rst

@@ -27,10 +27,10 @@ Experiment names and metadata
 The *laboratory* contains the following subdirectories:
 
 * ``work``, which is where the model is run. This contains a temporary directory
-for each experiment which is removed after a successful run.
+  for each experiment which is removed after a successful run.
 
 * ``archive``, which contains the output of completed runs for each 
-experiment.
+  experiment.
 
 An experiment name is used identify the experiment inside the ``work`` and 
 ``archive`` sub-directories. This is stored in a metadata file, 
@@ -43,7 +43,7 @@ is set in ``metadata.yaml`` when:
 * Using payu to create and checkout a new git branch in the *control directory*
 
 * Or, it is set automatically when setting up an experiment run if there is 
-not a pre-existing metadata file.
+  not a pre-existing metadata file.
 
 The experiment name historically would default to the name of the *control 
 directory* or the configured ``experiment`` value (see :ref:`config`). This is 
@@ -54,13 +54,13 @@ For example, given a control directory named ``my_expt`` and a UUID of
 ``9fAsTc4sNYsH2ZBQGYK9TG``, the experiment name would be:
 
 * ``my_expt-perturb-9fAsT`` - if running an experiment on a branch named 
-``perturb``.
+  ``perturb``.
 
 * ``my_expt-9fAsT`` - if the control directory was not a git repository or 
-running experiments from the ``main`` or ``master`` branch.
+  running experiments from the ``main`` or ``master`` branch.
 
 * or ``my_expt`` - if running an older experiment that has a pre-existing 
-archive.
+  archive.
 
 Using a git repository for the experiment
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