Spec V1.1: 2.2.5.2 removeObjectFromFolder

[me <dave8435@gmail.com>]

1) State that the optional folderId input is required when capabilityUnfiling=false.

2) State which exception should be thrown for a single-filed document when capabilityUnfiling=false.  "2.2.5.2.3 Exceptions Thrown & Conditions" says, "See section 2.2.1.4.1 General Exceptions."    The closest general exceptions are notSupported and runtime.   Another exception might be constraint which is in "2.2.1.4.2 Specific Exceptions"