updates to documentation files

minor edits to RTD text

Update CAM-PROV_Data_Examples_v2

Merge branch 'master' of https://github.com/data2health/contribution-data-model

minor updates to landing text

Update introduction.rst

Update introduction.rst

Update README.md

Update ontologies.rst

Update ontologies.rst

update code-and-services to code

rename code-and-services to code

Update index.rst

Update introduction.rst

Update and rename code_and_services.rst to code.rst