Update organisations.rst

[Rorie-Edmunds]

Line 32: Fixed typo

[Rorie-Edmunds]

The below note for 6.3.1 organisation.role.id does not seem very useful without either the full citations or links to the documents.
Note: Roles are likely to vary by region; controlled list adapted from Simon Cox’s Project Ontology, OpenAIRE ‘Project’ guidelines, NIH definitions, ARC definitions, and DataCite Metadata Schema 4.4 Appendix 1 Table 5 ‘Description of contributorType’.