Incorrect documentation for BlameHunk

[JC3]

The documentation for BlameHunk at https://www.nodegit.org/api/blame_hunk/ lists all fields as "instance variables".

None of them are instance variables of the specified type. All of them are functions returning the specified type.

The documentation should list them as class methods.

There are a number of other objects besides BlameHunk that have this same error, so I'm presuming it's a consequence of how the documentation is generated.