Document patch examples on the spec are incorrect

[ayuwono]

Document patch examples on the spec are incorrect

    p.replace('/parent2/child2', '?', p.multiply(5)),
    p.replace('/parent3/child3', p.apply('my-function', 'myArgument1', 2)),

[ehennum]

the specification is right, not the implementation

[ehennum]

should be working now

[ayuwono]

Closing backlog issue, the issue has regression test