ProjectType had (deprecated) added to the description of some of its
fields in d1451e7b. These were added because the same properties had
been deprecated in the REST Projects API in favor of properties called
`{x}_access_level`
https://gitlab.com/gitlab-org/gitlab/-/issues/211620#note_315174858.

As the GraphQL ProjectType does not have such fields, the fields that
had "(deprecated)" added to their descriptions were never actually
deprecated.

This MR removes those strings, and also makes the descriptions more
consistent according to
https://docs.gitlab.com/ee/development/api_graphql_styleguide.html#description-styleguide:

> Descriptions of GraphQL::BOOLEAN_TYPE fields should answer the
> question: “What does this field do?”. Example: 'Indicates project has
> a Git repository'.

https://gitlab.com/gitlab-org/gitlab/-/issues/211620