Ensure correct values are displayed in guidelines for boolean fields

[ESapenaVentura]

For which schema is a change/update being suggested?

• json_schema/module/project/contact.json
• json_schema/module/process/sequencing/10x.json
• json_schema/type/protocol/sequencing/sequencing_protocol.json
• json_schema/type/project/project.json

What should the change/update be?

The following fields should have their examples updated to reflect the acceptable value in the json file, rather than the user friendly inputs:

• json_schema/module/project/contact.json: corresponding_contributor property
• json_schema/module/process/sequencing/10x.json: drop_uniformity property
• json_schema/type/protocol/sequencing/sequencing_protocol.json: paired_end property
• json_schema/type/project/project.json: official_hca_publication property (Not yet available, in PR discussion now)

This update constitutes a patch change to the schema(s) it affects.

Why is the change requested?

As per the discussion going on in the PR https://github.com/HumanCellAtlas/metadata-schema/pull/1396/files#r665483651, it was pointed out that example field. of the properties should reflect the contents of the JSON files and not reflect the implementation of how the schema is presented to the user.