Fix redundancy in scope note of gist:description

[rjyounes]

Current note reads: "This property is used to provide a description of an instance entity in greater detail than a label."

"Entity" and "instance" are redundant. Choose one.

[rjyounes]

@uscholdm I think we can fast-track this one. Do you prefer "instance" or "entity" or maybe "resource"?