[Developers] Changing expected type of /business/company/major_shareholders to Company Shareholder

[Bryan Cheung]

https://bugs.freebase.com/browse/DA-509

The property /business/company/major_shareholders currently has an  
expected type of /people/person, which is problematic since other  
types of entities can hold shares in a company.  I'd like to update  
the expected type to a new type Company Shareholder.  Are there  
developers that have queries that would break if I update the expected  
type of this property?

Bryan