minor text updates to sustainability.md and sustainability.yaml

[odscjen]

Related issues

closes #489 I also noticed a few more instances of "labour" rather than "labor" so fixed them too

Description

Merge checklist

• Log your changes

Its such minor changes I don't think we need a changelog entry, let me know if you think we do and I can add one

If there are changes to project-schema.json or project-package-schema.json:

• Update the examples:
  • docs/examples/example.json
  • docs/examples/blank.json
• Run ./manage.py pre-commit to update docs/_static/i8n.csv

If you added a new definition to the schema, run ./manage.py pre-commit.

If you added a new codelist:

• Add an entry to docs/reference/codelists.md

[duncandewhurst]

Changes look good apart from the one I commented on.

[odscjen]

I attempted to run .manage.py pre-commit and got the following error

File "/***/infrastructure/./manage.py", line 176, in _get_definition_references
_get_definition_references(value, defn, [*parents, key], project_schema, include_nested)
TypeError: pre_commit.._get_definition_references() takes from 2 to 4 positional arguments but 5 were given

[jpmckinney]

I attempted to run .manage.py pre-commit and got the following error

Fixed