Error message clarification for accessing protected members

[tarikeshaq]

Fixes #35989

Adds clarification on the error when accessing protected members of a superclass. Based on this #35989 (comment).

Old message (from the issue):

Property 'doTransfer' is protected and only accessible through an instance of class 'HostileBankAccount'.

Adding the actual instance, so new message:

Property 'doTransfer' is protected and only accessible through an instance of class 'HostileBankAccount'. This is an instance of 'BankAccount'.

Rendered view of how it looks like when the compiler is run:

This is my first contribution here so happy to make any changes (or close this if it's not needed, the ticket didn't have much activity lately 😄)

[ghost]

All CLA requirements met.

[sandersn]

Very nice -- I requested an elaboration but now that I see it on a single line, I think I like it better that way.