function readOnly(count){ }
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Review below working example to update field on content version.
https://developer.salesforce.com/forums/?id=9060G0000005XgBQAU
https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/api/sforce_api_objects_contentversion.htm
Also from above documentation I can see title has properties of (Create, Filter, Group, Sort, Update).
Hope above information was helpful.
Please mark as Best Answer so that it can help others in the future.
Thanks,
Vinay Kumar