Spec V1.1: 2.2.5 Multi-filing Services

[me <dave8435@gmail.com>]

Section 2.2.5 says, "The Multi-filing services are supported only if the repository supports the multifiling or unfiling optional ca-pabilities (capabilityMultifiling)."

Change "multifiling or unfiling optional capabilities (capabilityMultifiling)" to "optional capabilityMultifiling".

Reason:     "unfiling" (in  "multifiling or unfiling") might imply capabilityUnfiling, and that capability is not sufficient.  The addObjectToFolder and removeObjectFromFolder services are not supported when capabilityUnfiling=true and capabilityMultifiling=false.