chore: Use RST syntax

docs/profiles/infrastructure.rst

@@ -66,11 +66,10 @@ You can then:
 -  Edit the workbook in your preferred spreadsheet software
 -  Export each sheet as a CSV file to the ``mapping`` directory
 
-
 Update sustainability.yaml
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-For each change to the [CoST IDS sustainability elements](https://docs.google.com/spreadsheets/d/165epI69oQ5YyL4-2q8VubFn9VuNham2Pi1u0P49id9o/), run:
+For each change to the `CoST IDS sustainability elements <https://docs.google.com/spreadsheets/d/165epI69oQ5YyL4-2q8VubFn9VuNham2Pi1u0P49id9o/>`__, run:
 
 .. code-block:: shell
 
@@ -79,15 +78,15 @@ For each change to the [CoST IDS sustainability elements](https://docs.google.co
 Update sustainability.md
 ~~~~~~~~~~~~~~~~~~~~~~~~
 
-For each change to `mapping/sustainability.yaml`:
+For each change to ``mapping/sustainability.yaml``:
 
-1. Lint the YAML file and link field names to the schema reference documentation:
+1. Lint it, and link any field names to the schema reference documentation:
 
 .. code-block:: shell
 
   ./manage.py lint -l mapping/sustainability.yaml
 
-2. Update the associated Markdown page:
+2. Update ``docs/cost/ids/sustainability.md``:
 
 .. code-block:: shell